Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information (Unaudited) Quarterly Financial Information [Text Block] Income Tax Disclosure [Abstract] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Net revenues Revenue, Net Gross profit (loss) Gross Profit Net income (loss) applicable to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Basic earnings (loss) per common share (in dollars per share) Earnings Per Share, Basic Diluted earnings (loss) per common share (in dollars per share) Earnings Per Share, Diluted Quarterly Financial Information [Table] Quarterly Financial Information [Table] Quarterly Financial Information [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Helix 534 [Member] Helix 534 [Member] Helix 534 [Member] HP I [Member] HP I [Member] HP I [Member] Capitalized Vessel Project Costs [Member] Capitalized Vessel Project Costs [Member] Capitalized Vessel Project Costs [Member] Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Well Intervention [Member] Well Intervention [Member] Well Intervention [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Deepwater Gateway LLC and Independence Hub LLC [Member] Deepwater Gateway LLC And Independence Hub LLC [Member] Deepwater Gateway LLC And Independence Hub LLC [Member] Quarterly Financial Information [Line Items] Quarterly Financial Information [Line Items] Quarterly Financial Information [Line Items] Impairment charges Impairment of Long-Lived Assets Held-for-use Impairment charges to write off capitalized costs Impairment of Long-Lived Assets to be Disposed of Goodwill impairment Goodwill, Impairment Loss Loss from equity method investments Income (Loss) from Equity Method Investments Unrealized losses on derivatives Unrealized Gain (Loss) on Derivatives Effective Income Tax Rate Reconciliation, Percent [Abstract] Statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Foreign provision (as a percent) Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Other (as a percent) Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Stockholders' Equity Note [Abstract] Cumulative foreign currency translation adjustment Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Unrealized loss on hedges, net Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Deferred income taxes Deferred Tax Assets, Other Comprehensive Loss Domestic Federal Income Tax Expense (Benefit), Continuing Operations Foreign Foreign Income Tax Expense (Benefit), Continuing Operations Income tax provision (benefit) Income Tax Expense (Benefit) Accounting Policies [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Dry dock amortization period Dry Dock Amortization Period The length of time in which the deferred dry dock costs are amortized. Dry dock recertification process period Dry Dock Recertification Process Period The length of time to complete the dry dock and recertification process. Deferred dry dock expenses, net Deferred Drydock Expenses, Net Deferred Drydock Expenses, Net Accumulated amortization deferred dry dock Accumulated Amortization Deferred Dry Dock Carrying amount of accumulated amortization of deferred dry dock at the end of the reporting period Dry dock amortization expense Dry Dock Amortization Expense Expense related to amortization of deferred dry dock charges Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Caesar [Member] Caesar [Member] Caesar [Member] Express [Member] Express [Member] Express [Member] Spoolbase Facility [Member] Spoolbase Facility [Member] Spoolbase Facility [Member] Office and Warehouse Property [Member] Building [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Forecast [Member] Scenario, Forecast [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Scotland [Member] UNITED KINGDOM Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Proceeds from sale of assets Proceeds from Sale of Property, Plant, and Equipment (Loss) gain on sale of assets Gain (Loss) on Sale of Assets and Asset Impairment Charges Sales price of property and equipment Sales Price Of Property Plant And Equipment The total sales price of property, plant and equipment. Note receivable Financing Receivable, Gross Note receivable, interest rate Notes Receivable Interest Stated Rate Percentage The stated interest rate of the note receivable. Note receivable, periodic principal payment Proceeds from Collection of Notes Receivable Estimated fair value Property, Plant, and Equipment, Fair Value Disclosure Write off of deferred dry dock costs Write Off Of Deferred Drydock Expenses Write Off Of Deferred Drydock Expenses Gain from sale of property Gain (Loss) on Disposition of Property Plant Equipment Term of agreement Lessee Leasing Arrangements, Operating Leases, Term of Contract Number of renewal options Lessee Leasing Arrangements, Operating Leases, Number Of Renewal Options Lessee Leasing Arrangements, Operating Leases, Number Of Renewal Options Term of renewal option Lessee Leasing Arrangements, Operating Leases, Renewal Term Valuation and Qualifying Accounts [Abstract] Allowance Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Supplemental Cash Flow Information [Abstract] Interest paid, net of interest capitalized Interest Paid, Net Income taxes paid Income Taxes Paid Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of other current assets Schedule of Other Current Assets [Table Text Block] Schedule of other assets, net Schedule of Other Assets, Noncurrent [Table Text Block] Schedule of accrued liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of other non-current liabilities Other Noncurrent Liabilities [Table Text Block] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] Revenues Equity Method Investment, Summarized Financial Information, Revenue Operating income (loss) Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations before Extraordinary Items Net income (loss) Equity Method Investment, Summarized Financial Information, Net Income (Loss) Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract] [Abstract] Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract] [Abstract] Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract] [Abstract] Current assets Equity Method Investment, Summarized Financial Information, Current Assets Non-current assets Equity Method Investment, Summarized Financial Information, Noncurrent Assets Current liabilities Equity Method Investment, Summarized Financial Information, Current Liabilities Non-current liabilities Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities Debt Disclosure [Abstract] Long-Term Debt Debt Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies and Other Matters Commitments and Contingencies Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Total Controlling Interest Shareholders' Equity [Member] Parent [Member] Common Stock [Member] Common Stock [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance, beginning of period (in shares) Common Stock, Shares, Outstanding Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Unrealized gain (loss) on hedges, net Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Equity component of debt discount on Convertible Senior Notes due 2032 Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Acquisition of noncontrolling interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Stock compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Cumulative stock compensation expense in excess of fair value of modified liability awards Adjustments To Additional Paid In Capital, Share-based Compensation In Excess Of Modified Liability Awards Fair Value Adjustments To Additional Paid In Capital, Share-based Compensation In Excess Of Modified Liability Awards Fair Value Stock repurchases Stock Repurchased During Period, Value Stock repurchases (in shares) Stock Repurchased During Period, Shares Activity in company stock plans, net and other Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Activity in company stock plans, net and other (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Excess tax from stock-based compensation Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Balance, end of period Balance, end of period (in shares) Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Awards outstanding at beginning of year (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Awards outstanding at end of year (in shares) Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Awards outstanding at beginning of year (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Awards outstanding at end of year (in dollars per share) Fair value of awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Recorded liability Deferred Compensation Liability, Current and Noncurrent Long-term incentive cash awards paid Deferred Compensation Arrangement with Individual, Distributions Paid Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Equity Method Investee, Name [Domain] Deepwater Gateway, LLC [Member] Deepwater Gateway L L C [Member] Deepwater Gateway, L.L.C [Member] Independence Hub, LLC [Member] Independence Hub Llc [Member] Independence Hub, LLC [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Percentage of ownership interest Equity Method Investment, Ownership Percentage Equity investments in unconsolidated affiliates Equity Method Investments Capitalized interest Capitalized Interest The balance of interest capitalized, net, related to the Company's equity method investments or property, plant and equipment. Participation fee Payments for Participation Liabilities Water depth (in feet) Water Depth Depth of the water. Amount loss exceeded carrying amount of investment Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Consideration transferred for business sold Business Combination, Consideration Transferred Impairment charge Asset retirement obligation Asset Retirement Obligation Asset retirement obligation, net of remaining working capital Asset Retirement Obligation, Net Of Working Capital Asset Retirement Obligation, Net Of Working Capital Cash distributions Proceeds from Equity Method Investment, Dividends or Distributions Sale of ownership interest for cash Proceeds from Sale of Equity Method Investments Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Consolidated Leverage Ratio, Period [Axis] Consolidated Leverage Ratio, Period [Axis] Consolidated Leverage Ratio, Period [Axis] Consolidated Leverage Ratio, Period [Domain] Consolidated Leverage Ratio, Period [Domain] [Domain] for Consolidated Leverage Ratio, Period [Axis] June 30, 2015 [Member] Period 1 [Member] Period 1 [Member] September 30, 2015 through and including March 31, 2016 [Member] Period 2 [Member] Period 2 [Member] June 30, 2016 [Member] Period 3 [Member] Period 3 [Member] September 30, 2016 through and including December 31, 2016 [Member] Period 4 [Member] Period 4 [Member] March 31, 2017 [Member] Period 5 [Member] Period 5 [Member] June 30, 2017 [Member] Period 6 [Member] Period 6 [Member] September 30, 2017 [Member] Period 7 [Member] Period 7 [Member] December 31, 2017 and each fiscal quarter thereafter [Member] Period 8 [Member] Period 8 [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] May 2015 Amendment [Member] Credit Agreement May 2015 Amendment [Member] Credit Agreement May 2015 Amendment [Member] February 2016 Amendment [Member] Credit Agreement February 2016 Amendment [Member] Credit Agreement February 2016 Amendment [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit [Member] Line of Credit [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Maximum Consolidated Leverage Ratio Ratio of Indebtedness to Net Capital Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative [Table] Derivative [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accrued Liabilities [Member] Accrued Liabilities [Member] Other Non-Current Liabilities [Member] Other Liabilities [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Foreign Exchange Contracts [Member] Foreign Exchange Contract [Member] Derivative [Line Items] Derivative [Line Items] Liability derivatives not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value Schedule of fair value and balance sheet classification of derivative instruments designated as hedging instruments Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of fair value and balance sheet classification of derivative instruments not designated as hedging instruments Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of impact of derivative instruments on Accumulated OCI Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Schedule of loss reclassified from Accumulated OCI into Earnings Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of impact of derivative instruments not designated as hedges on consolidated statement of operations Schedule Of Non Designated Derivative Instruments Effect On Income Statement [Table Text Block] Schedule Of Non Designated Derivative Instruments Effect On Income Statement [Table Text Block] Term Loan Maturing June 2018 [Member] Term Loan Maturing June 2018 [Member] Term Loan Maturing June 2018 [Member] Revolving Credit Facility Maturing June 2018 [Member] Revolving Credit Facility Maturing June 2018 [Member] Revolving Credit Facility Maturing June 2018 [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Years One And Two [Member] Debt Instrument, Redemption, Period One [Member] Years Three Through Five [Member] Debt Instrument, Redemption, Period Two [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Base Rate [Member] Base Rate [Member] LIBOR [Member] London Interbank Offered Rate (LIBOR) [Member] Interest Rate Swaps [Member] Interest Rate Swap [Member] Original borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Increase in aggregate commitments (up to) Line Of Credit Facility, Maximum Additional Commitments The maximum additional commitments that may be requested under the credit facility. Available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Letters of credit issued Letters of Credit Outstanding, Amount Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Notional amount Derivative, Notional Amount Lower range of fixed LIBOR rate (as a percent) Derivative, Lower Range of Basis Spread on Variable Rate Higher range of fixed LIBOR rate (as a percent) Derivative, Higher Range of Basis Spread on Variable Rate Percentage of scheduled principal installments Debt Instrument, Periodic Payment, Principal, Percentage Amount of the required periodic payments applied to principal as a percentage. Scheduled principal installments Debt Instrument, Periodic Payment, Principal Balloon payment Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid Maturity date Debt Instrument, Maturity Date Number of foreign subsidiaries designated as not subject to Credit Agreement covenants Number Of Foreign Subsidiaries Not Subject To Credit Agreement Covenants Number Of Foreign Subsidiaries Not Subject To Credit Agreement Covenants Segment Reporting [Abstract] Business Segment Information Segment Reporting Disclosure [Text Block] Cost of property repairs and maintenance Cost of Property Repairs and Maintenance Statement of Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Former Term Loan [Member] Former Term Loan [Member] Former Term Loan [Member] Senior Unsecured Notes [Member] Senior Unsecured Notes [Member] Senior Unsecured Notes [Member] Charge to accelerate deferred financing costs Amortization of Financing Costs Loss on early extinguishment of debt Gains (Losses) on Extinguishment of Debt Call premium Payments of Debt Extinguishment Costs Deferred financing costs Payments of Financing Costs Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Oil and Gas Commodity Contracts [Member] Oil And Gas Commodity Contract [Member] Oil And Gas Commodity Contracts [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement and Other Comprehensive Income (Loss) Location [Domain] Income Statement Location [Domain] Loss on Commodity Derivative Contracts [Member] Non Hedge Loss On Commodity Derivative Contracts [Member] Non Hedge Loss On Commodity Derivative Contracts [Member] Other Income (Expense), Net [Member] Other Expense [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Gain (Loss) Recognized in Earnings on Derivatives Derivative, Gain (Loss) on Derivative, Net Details of Certain Accounts Supplemental Balance Sheet Disclosures [Text Block] Current Current Income Tax Expense (Benefit) Deferred Deferred Other Tax Expense (Benefit) Convertible Senior Notes 2032 [Member] Convertible Senior Notes 2032 [Member] Convertible Senior Notes 2032 [Member] MARAD Debt 2027 [Member] Marad Debt [Member] MARAD Debt [Member] Nordea Q5000 Loan 2020 [Member] Nordea Q5000 Loan [Member] Nordea Q5000 Loan Less than one year Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months One to two years Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two Two to three years Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three Three to four years Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four Four to five years Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five Over five years Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five Total debt Long-term Debt, Gross Less current maturities Long-term Debt, Current Maturities Long-term debt, less current maturities Debt Instrument Noncurrent Sum of the carrying values as of the balance sheet date of all long-term debt, before deducting unamortized discount or premium. Unamortized debt discount Debt Instrument, Unamortized Discount Long-term debt Long-term Debt, Excluding Current Maturities Maturity date Debt Instrument, Maturity Date, Description Organization Nature of Operations [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Changes in the carrying amount of goodwill Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Robotics [Member] Robotics [Member] Robotics [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Balance at beginning of period Goodwill Impairment loss Other adjustments Goodwill, Other Changes Balance at end of period Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Share-Based Awards [Member] Employee Stock Option [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Diluted shares (as reported) Weighted Average Number of Shares Outstanding, Diluted Anti-dilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Total (in shares) Weighted Average Number Of Diluted Shares Including Anti-Dilutive Securities Weighted Average Number Of Diluted Shares Including Anti-dilutive Securities Schedule of financial data by reportable segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of intercompany segment revenues Summary Of Intercompany Segment Revenues [Table Text Block] Summary Of Intercompany Segment Revenues [Table Text Block] Schedule of revenue by individually significant region Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Schedule of property and equipment, net of accumulated depreciation, by individually significant region Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Schedule of supplemental cash flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Segments [Member] Operating Segments [Member] Intercompany Elimination [Member] Intersegment Eliminations [Member] Corporate and Other [Member] Corporate, Non-Segment [Member] Corporate and Eliminations [Member] Corporate And Eliminations [Member] Corporate And Eliminations [Member] Production Facilities [Member] Production Facilities [Member] Production Facilities [Member] Subsea Construction [Member] Subsea Construction [Member] Subsea Construction [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Income (loss) from operations Operating Income (Loss) Net interest expense Net Interest Expense and Other Net Interest Expense and Other Equity in earnings (losses) of investments Income (loss) before income taxes Income tax provision (benefit) Identifiable assets Assets Capital expenditures Payments to Acquire Productive Assets Depreciation and amortization Depreciation, Depletion and Amortization Goodwill impairment Gain (loss) on sale of assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Other income Other Nonoperating Income Proceeds from insurance reimbursement Proceeds from Insurance Settlement, Operating Activities Schedule of components of income tax provision (benefit) on continuing operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of components of income (loss) before income taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of differences between the U.S. statutory rate and effective rate from continuing operations Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of deferred income taxes Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Reconciliation of beginning and ending amount of unrecognized tax benefits Summary of Income Tax Contingencies [Table Text Block] Schedule of future minimum rental payments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Equity Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] United States [Member] UNITED STATES United Kingdom [Member] Singapore [Member] SINGAPORE Other [Member] Other Geographic Region [Member] Other Geographic Region [Member] Property and equipment, net Property, Plant and Equipment, Net Income Statement Location [Domain] Other income (expense), net [Member] Other Nonoperating Income (Expense) [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedging [Member] Cash Flow Hedging [Member] Grand Canyon [Member] Grand Canyon [Member] Grand Canyon [Member] Grand Canyon II [Member] Grand Canyon II [Member] Grand Canyon II [Member] Grand Canyon III [Member] Grand Canyon I I I [Member] Grand Canyon III [Member] Grand Canyon II and Grand Canyon III [Member] Foreign Exchange Contracts For Grand Canyon II And Grand Canyon III [Member] Foreign Exchange Contracts For Grand Canyon II And Grand Canyon III [Member] Unrealized losses related to foreign currency contracts Gain (Loss) on Discontinuation of Foreign Currency Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net Unrealized loss on hedges, net Realized loss on hedge ineffectiveness Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net Unrealized loss on hedge ineffectiveness Unrealized Gain (Loss) on Cash Flow Hedging Instruments Loss in Accumulated OCI to be reclassified within twelve months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Foreign currency translation losses included in Accumulated other comprehensive loss Foreign currency transaction gains (losses) Foreign Currency Transaction Gain (Loss), before Tax Number of reporting units Number of Reporting Units Gross Carrying Amount Deferred Finance Costs, Noncurrent, Gross Accumulated Amortization Accumulated Amortization of Noncurrent Deferred Finance Costs Gross Carrying Amount Deferred Finance Costs, Noncurrent, Net Summary of consolidated quarterly financial information Schedule of Quarterly Financial Information [Table Text Block] Non-cash investing accruals Capital Expenditures Incurred but Not yet Paid Non-cash transaction Other Significant Noncash Transaction, Value of Consideration Received Earnings Per Share Earnings Per Share [Text Block] Distributions from equity method investments Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital Schedule of distributions from equity method investments Schedule of distributions from equity investments [Table Text Block] Schedule of distributions from equity investments [Table Text Block] Summary of financial information related to equity method investments Equity Method Investments [Table Text Block] Cost of Sales [Member] Cost of Sales [Member] Net Interest Expense [Member] Interest Expense [Member] Loss Reclassified from Accumulated OCI into Earnings (Effective Portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Trade Receivables [Member] Allowance for Trade Receivables [Member] Operating Loss Carryforwards Valuation Allowance [Member] Valuation Allowance, Operating Loss Carryforwards [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Adjustments Valuation Allowances and Reserves, Adjustments Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Groups, Including Discontinued Operations, Name [Domain] Disposal Group Name [Domain] Energy Resource Technology GOM, Inc [Member] Energy Resource Technology Gom Inc [Member] Energy Resource Technology GOM, Inc [Member] Interest expense Interest Expense Interest income Interest Income, Other Capitalized interest Interest Costs Capitalized Adjustment Net interest expense Interest Income (Expense), Nonoperating, Net Income Taxes Income Tax Disclosure [Text Block] Allowance for Uncollectible Accounts [Member] Allowance for Doubtful Accounts [Member] Deferred Tax Asset Valuation Allowance [Member] Valuation Allowance of Deferred Tax Assets [Member] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at the beginning of period Valuation Allowances and Reserves, Balance Additions Valuation Allowances and Reserves, Charged to Cost and Expense Deductions Valuation Allowances and Reserves, Deductions Adjustments Balance at the end of period Equity [Abstract] Total shares repurchased (in shares) Total shares repurchased Total Stock Repurchase Value Total stock repurchase value Repurchase of common stock value per share (in dollars per share) Stock Repurchased And Retired During Period Average Cost Per Share Stock repurchased and retired during period average cost per share Remaining number of shares available to be repurchased Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Frequency of periodic payment Debt Instrument, Frequency of Periodic Payment Guarantor obligations (as a percent) Guarantor Obligations, Liquidation Proceeds, Percentage Interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Vessels [Member] Rovs And Vessels [Member] ROVs And Vessels [Member] Facilities and Other [Member] Facilities And Other [Member] Facilities And Other [Member] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2016 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2017 Operating Leases, Future Minimum Payments, Due in Two Years 2018 Operating Leases, Future Minimum Payments, Due in Three Years 2019 Operating Leases, Future Minimum Payments, Due in Four Years 2020 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total lease commitments Operating Leases, Future Minimum Payments Due Interest Coverage Ratio, Period [Axis] Interest Coverage Ratio, Period [Axis] Interest Coverage Ratio, Period [Axis] Interest Coverage Ratio, Period [Domain] Interest Coverage Ratio, Period [Domain] [Domain] for Interest Coverage Ratio, Period [Axis] March 31, 2016 through and including September 30, 2016 [Member] December 31, 2016 through and including March 31, 2017 [Member] June 30, 2017 and each fiscal quarter thereafter [Member] Minimum Consolidated Interest Coverage Ratio Consolidated Interest Coverage Ratio Consolidated Interest Coverage Ratio Schedule of components of Accumulated OCI Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Income Statement [Abstract] Cost of sales: Cost of Revenue [Abstract] Cost of sales Contract Revenue Cost Asset impairments Total cost of sales Cost of Revenue Gross profit (loss) Goodwill impairment Loss on commodity derivative contracts Gain (Loss) On Commodity Derivative Contracts Amount of increase (decrease) in fair value of commodity derivatives recognized in income. Gain on disposition of assets, net Selling, general and administrative expenses Selling, General and Administrative Expense Income (loss) from operations Net interest expense Loss on early extinguishment of long-term debt Other income (expense), net Other Nonoperating Income (Expense) Other income – oil and gas Income tax provision (benefit) Net income (loss) from continuing operations Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net income (loss), including noncontrolling interests Less net income applicable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) applicable to common shareholders Basic earnings (loss) per share of common stock: Earnings Per Share, Basic [Abstract] Continuing operations (in dollars per share) 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Plan of US Entity [Member] E S P P [Member] E S P P [Member] Employee Stock Purchase Plan [Member] 2005 Incentive Plan [Member] Incentive Plan 2005 [Member] Incentive Plan 2005 [Member] Restricted Stock Units and Restricted Stock Shares [Member] Restricted Stock Units And Restricted Stock Shares [Member] Restricted Stock Units And Restricted Stock Shares [Member] Performance Shares [Member] Performance Shares [Member] Modified Liability Performance Share [Member] Modified Liability Performance Share [Member] Modified Liability Performance Share [Member] Long-Term Incentive Cash Plans [Member] Long Term Incentive Cash Plans [Member] Long-Term Incentive Cash Plans [Member] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Type of Deferred Compensation [Domain] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Maximum Shares As 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Percentage of share of non-vested stock considered as put option Percentage of share of non-vested stock considered as put-option Percentage of share of non-vested stock considered as put-option. Allocated share-based compensation expense Allocated Share-based Compensation Expense Number of stock plans Number Of Stock Plans The number of stock-based compensation plans. Additional shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Awards granted vesting percentage Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage Market value per share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased Compensation cost Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost Compensation expense in excess of fair value recorded in equity Share-based Compensation Arrangement By Share-based Payment Award, Compensation Cost In Excess Of Fair Value Share-based Compensation Arrangement By Share-based Payment Award, Compensation Cost In Excess Of Fair Value Forfeiture on restricted stock percentage Forfeitures On Restricted Stock Percentage Forfeiture percentage of restricted stock Forfeiture on restricted stock period Forfeiture On Restricted Stock Period The average period in which the forfeiture percentage is calculated. Future compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average vesting period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Award percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Grants in period (in shares) Performance Share Units Granted Number of performance share units granted Grant date fair value (in dollars per share) Performance Share Unit Market Value Fair value of performance share units on grant date as determined using Monte Carlo simulation model. Stock option grants (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options exercised in period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Minimum percentage of average price during measurement period (less than) Minimum percentage of average price during measurement period Minimum percentage of average price during measurement period. Deferred compensation arrangement with individual award vesting period Deferred Compensation Arrangement With Individual Award Vesting Period The vesting period of the cash awards under the LTI plan. Long-term incentive cash awards granted Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount Compensation expense Deferred Compensation Arrangement with Individual, Compensation Expense Deferred compensation cash-based arrangement, liability Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent Continuing operations: Income (Loss) from Continuing Operations Attributable to Parent [Abstract] Basic: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Less: Income from discontinued operations, net of tax Net income (loss) from continuing operations Income (Loss) from Continuing Operations Attributable to Parent Less: Undistributed income allocable to participating securities – continuing operations Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Net income (loss) applicable to common shareholders – continuing operations Net Income Loss Available To Common Stockholders Basic Continuing Operations Net Income Loss Available To Common Stockholders Basic Continuing Operations Weighted average number of shares outstanding - basic (in shares) Diluted: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Net income (loss) applicable to common shareholders – continuing operations Effect of dilutive securities: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Share-based awards other than participating securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Undistributed income reallocated to participating securities Undistributed Earnings Reallocated To Participating Securities Value Undistributed Earnings Reallocated To Participating Securities Value Net income (loss) applicable to common shareholders – continuing operations Net Income (Loss) Available to Common Stockholders, Diluted Weighted average number of shares outstanding, diluted Discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent [Abstract] Less: Undistributed income allocable to participating securities – discontinued operations Undiscounted Net Income From Discontinued Operations Allocable To Participating Securities Undiscounted Net Income From Discontinued Operations Allocable To Participating Securities Net income applicable to common shareholders – discontinued operations Net Income Loss Available To Common Stockholders Basic, Discontinued Operations Net Income Loss Available To Common Stockholders Basic, Discontinued Operations Summary of activity in valuation accounts Summary of Valuation Allowance [Table Text Block] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Grand Canyon II and III [Member] Grand Canyon II and III [Member] Grand Canyon II and III [Member] Q7000 [Member] Q7000 [Member] Q7000 [Member] Monohull Vessels [Member] Monohull Vessels [Member] Monohull Vessels [Member] Topside Equipment [Member] Topside Equipment [Member] Topside Equipment [Member] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Capital Addition Purchase Commitments [Member] Capital Addition Purchase Commitments [Member] Payment Terms [Axis] Payment Terms [Axis] Payment Terms Payment Terms [Domain] Payment Terms [Domain] Payment Terms Contract Signing [Member] Contract Signing [Member] Contract Signing Due June 2016 [Member] Due June 2016 [Member] Due June 2016 [Member] Issuance of Completion Certificate [Member] Issuance of Completion Certificate [Member] Issuance of Completion Certificate [Member] Vessel Delivery [Member] Vessel Delivery [Member] Vessel Delivery Incremental Costs [Axis] Incremental Costs [Axis] Incremental Costs [Axis] Incremental Costs [Domain] Incremental Costs [Domain] [Domain] for Incremental Costs [Axis] Extend Scheduled Delivery [Member] Extend Scheduled Delivery [Member] Extend Scheduled Delivery [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Term of charter agreement Term Of Charter Agreement Term of charter agreement in years. Non-refundable proceeds from charter agreement Proceeds From Charter Agreement, Non-refundable Proceeds From Charter Agreement, Non-refundable Contract amount Long-term Purchase Commitment, Amount Percentage of contract price paid Long Term Purchase Commitment Percentage The percentage due of the amount the entity agreed to spend under the long-term purchase commitment. Number of installments to be paid Long-Term Purchase Commitment, Number Of Payment Installments Long-Term Purchase Commitment, Number Of Payment Installments Total investment Payment of shipyard incremental costs Payments to Acquire Property, Plant, and Equipment Number of vessels under construction Number Of Vessels Under Construction Number of Vessels Under Construction Charter fee deposit Total rental expense Operating Leases, Rent Expense, Net Total rental income Operating Leases, Rent Expense, Sublease Rentals Minimum rentals to be received in the future Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Annual minimum lease payment Operating Leases, Annual Payments Due Operating Leases, Annual Payments Due Contractual responsibility to reimburse third party for foreign withholding tax liability Contractual Obligation Fair Value Measurements Fair Value Disclosures [Text Block] Statement of Comprehensive Income [Abstract] Net income (loss), including noncontrolling interests Other comprehensive loss, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized loss on hedges arising during the period Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Reclassification adjustments for loss included in net income (loss) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Reclassification adjustments for loss from derivatives de-designated as cash flow hedges included in net income Other Comprehensive Income Loss Reclassification Adjustment on Derivatives Dedesignated Included In Net Income Before Tax Before tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivatives de-designated as cash flow hedges. Income taxes on unrealized loss on hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Unrealized gain (loss) on hedges, net of tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Foreign currency translation gain (loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less comprehensive income applicable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) applicable to common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent North Sea [Member] North Sea [Member] North Sea [Member] Total net revenues Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable: Accounts Receivable, Net [Abstract] Trade, net of allowance for uncollectible accounts of $350 and $4,735, respectively Accounts Receivable, Net, Current Unbilled revenue Unbilled Contracts Receivable Costs in excess of billing Costs in Excess of Billings Current deferred tax assets Deferred Tax Assets, Net, Current Other current assets Other Assets, Current Total current assets Assets, Current Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Other assets: Assets, Noncurrent [Abstract] Equity investments Goodwill Other assets, net Total assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Income tax payable Accrued Income Taxes, Current Current maturities of long-term debt Total current liabilities Liabilities, Current Long-term debt Deferred tax liabilities Deferred Tax Liabilities, Net, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Shareholders’ equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock, no par, 240,000 shares authorized, 106,289 and 105,586 shares issued, respectively Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Total shareholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders’ equity Liabilities and Equity Gain (Loss) Recognized in OCI on Derivatives, Net of Tax (Effective Portion) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Depreciation Deferred Tax Liabilities, Property, Plant and Equipment Original Issue Discount on 2032 Notes Deferred Tax Liabilities, Financing Arrangements Equity investments in production facilities Deferred Tax Liabilities, Investment in Noncontrolled Affiliates Prepaid and other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Net operating losses Deferred Tax Assets, Operating Loss Carryforwards Reserves, accrued liabilities and other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Total deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred tax liabilities Deferred Tax Liabilities, Net Current deferred tax assets Non-current deferred tax liabilities Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Document And Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Noncontrolling interest, ownership percentage by noncontrolling owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Acquisition of noncontrolling interests Payments to Acquire Additional Interest in Subsidiaries Number of reportable segments Number of Reportable Segments Number of chartered vessels Number Of Chartered Vessels Number Of Chartered Vessels Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] U.S. [Member] Domestic Tax Authority [Member] Foreign [Member] Foreign Tax Authority [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Net operating loss carryforward or carryback Operating Loss Carryforwards Tax credit Tax Credit Carryforward, Amount Undistributed earnings of foreign subsidiaries Undistributed Earnings of Foreign Subsidiaries Unrecognized tax benefit, decrease resulting from settlements with taxing authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Income tax examination, penalties and interest expense Income Tax Examination, Penalties and Interest Expense Income tax examination, penalties and interest accrued Income Tax Examination, Penalties and Interest Accrued Income tax examination, reversal of penalties and interest accrued Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority Income tax refund Proceeds from Income Tax Refunds Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss), including noncontrolling interests, to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Income from discontinued operations, net of tax Depreciation and amortization Non-cash impairment charges Asset Impairment Charges Amortization of deferred financing costs Stock-based compensation expense Share-based Compensation Amortization of debt discount Amortization of Debt Discount (Premium) Deferred income taxes Deferred Income Tax Expense (Benefit) Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Equity in losses of investments Loss From Equity Method Investments Loss From Equity Method Investments Gain on disposition of assets, net Unrealized losses and ineffectiveness on derivative contracts, net Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, net Increase (Decrease) in Accounts Receivable Other current assets Increase (Decrease) in Other Current Assets Income tax payable Increase (Decrease) in Income Taxes Payable Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Oil and gas asset retirement costs Increase (Decrease) in Asset Retirement Obligations Other non-current, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash used in discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Distributions from equity investments, net of earnings Proceeds From Equity Method Investment Net Of Earnings The amount of dividends or distributions received from unconsolidated subsidiaries, net of earnings. Acquisition of noncontrolling interests Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash provided by discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Early extinguishment of Senior Unsecured Notes Early Repayment of Senior Debt Borrowings under revolving credit facility Proceeds from Long-term Lines of Credit Repayment of revolving credit facility Repayments of Long-term Lines of Credit Repurchase of Convertible Senior Notes due 2025 Repayments of Convertible Debt Proceeds from Nordea Q5000 Loan Repayment of Nordea Q5000 Loan Repayments of Secured Debt Proceeds from Term Loan Proceeds from Issuance of Other Long-term Debt Repayment of term loans Repayments of Other Long-term Debt Repayment of MARAD borrowings Repayments Of Long Term Secured Debt The cash outflows from the payment of collateralized debt obligation (backed by a lien on the entity's assets) to MARAD, a U.S. governmental agency. Deferred financing costs Distributions to noncontrolling interests Payments to Noncontrolling Interests Repurchases of common stock Payments for Repurchase of Common Stock Excess tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Exercise of stock options, net and other Proceeds from Stock Options Exercised Proceeds from issuance of ESPP shares Proceeds from Stock Plans Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents: Cash and Cash Equivalents, at Carrying Value [Abstract] Balance, beginning of year Balance, end of year Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Customer [Axis] Customer [Axis] Name of Major Customer [Domain] Customer [Domain] Shell [Member] Shell [Member] Shell [Member] Anadarko [Member] Anadarko [Member] Anadarko [Member] Talos [Member] Talos [Member] Talos [Member] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Percentage of concentration risk Concentration Risk, Percentage Schedule of share-based awards Schedule Of Restricted Shares Granted To Executive Officers Management Employees And Non Employee Members Table [Text Block] Schedule Of Restricted Shares Granted To Executive Officers Management Employees And Non Employee Members Table [Text Block] Summary of information about restricted stock Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Allowance for uncollectible accounts Allowance for Doubtful Accounts Receivable, Current Liabilities and Equity [Abstract] Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Note receivable (Note 4) Notes, Loans and Financing Receivable, Gross, Current Other receivables Other Receivables, Net, Current Prepaid insurance Prepaid Insurance Other prepaids Other Prepaid Expense, Current Spare parts inventory Prepaid Supplies Value added tax receivable Value Added Tax Receivable, Current Other Other Assets, Miscellaneous, Current Total other current assets Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Principal amount Initial conversion ratio Debt Instrument, Convertible, Conversion Ratio Initial conversion price per share (in dollars per share) Debt Instrument, Convertible, Conversion Price Redemption price as a percentage of principal amount Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Repurchase price as a percentage of principal amount Debt Instrument, Repurchase Amount, Percentage Debt Instrument, Repurchase Amount, Percentage Expected life used to estimate fair value Debt Instrument, Convertible, Remaining Discount Amortization Period Effective interest rate (as a percent) Debt Instrument, Interest Rate, Effective Percentage Carrying amount of equity component Debt Instrument, Convertible, Carrying Amount of Equity Component Unamortized debt discount Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Loan Notes [Member] Loan Notes [Member] Loan Notes [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Carrying Value Fair Value Long-term Debt, Fair Value Schedule of long-term debt Schedule of Debt [Table Text Block] Components of deferred financing costs Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Schedule of maturities of long-term debt outstanding Schedule of Maturities of Long-term Debt [Table Text Block] Components of net interest expense Interest Income and Interest Expense Disclosure [Table Text Block] Summary of gross components of property and equipment Property, Plant and Equipment [Table Text Block] Goodwill Goodwill Disclosure [Text Block] Total debt Long-term Debt Long-term debt Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] January 2, 2015 - 33% per year over three years [Member] Grant Share Amount [Member] Grant Share Amount A [Member] January 2, 2015 - 100% on January 1, 2018 [Member] Grant Share Amount B [Member] Grant Share Amount B [Member] January 5, 2015 - 100% on January 1, 2017 [Member] Grant Share Amount C [Member] Grant Share Amount C [Member] January 12, 2015 - 33% per year over three years [Member] Grant Share Amount D [Member] Grant Share Amount D [Member] January 12, 2015 - 100% on January 11, 2018 [Member] Grant Share Amount E [Member] Grant Share Amount E [Member] February 1, 2015 - 33% per year over three years [Member] Grant Share Amount F [Member] Grant Share Amount F [Member] February 1, 2015 - 100% on January 21, 2018 [Member] Grant Share Amount G [Member] Grant Share Amount G [Member] April 1, 2015 - 100% on January 1, 2017 [Member] Grant Share Amount H [Member] Grant Share Amount H [Member] July 1, 2015 - 100% on January 1, 2017 [Member] Grant Share Amount I [Member] Grant Share Amount I [Member] October 1, 2015 - 100% on January 1, 2017 [Member] Grant Share Amount J [Member] Grant Share Amount J [Member] December 3, 2015 - 33% per year over three years [Member] Grant Share Amount K [Member] Grant Share Amount K [Member] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Date of Grant Share Based Compensation Arrangement By Share Based Payment Award Grant Date Grant date of share-based payment award. Shares Grant Date Fair Value Per Share Vesting Percentage Vesting Period Vesting Date Share Based Compensation Arrangement By Share Based Payment Award Vesting date Vesting date of share-based payment award. Employee Benefit Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Loss in excess of equity investment (Note 5) Derivative liability (Note 18) Derivative Liability, Noncurrent Other Other Liabilities and Deferred Revenue, Noncurrent Total other non-current liabilities Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Other Assets, Net [Member] Other Assets [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Asset derivatives designated as hedging instruments Derivative Instruments in Hedges, Assets, at Fair Value Liability derivatives designated as hedging instruments Derivative Instruments in Hedges, Liabilities, at Fair Value Number of reportable segments Proceeds from sale of business Proceeds from Divestiture of Businesses Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Asset Class [Axis] Asset Class [Axis] Fair Value By Asset Class [Domain] Asset Class [Domain] Liability Class [Axis] Liability Class [Axis] Fair Value By Liability Class [Domain] Fair Value by Liability Class [Domain] Assets Assets, Fair Value Disclosure Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Total net liability Fair Value, Net Asset (Liability)