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Summary Of Significant Accounting Policies (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 USD ($) | Mar. 31, 2011 USD ($) | May 31, 2010 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2012 USD ($) | Jun. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) customer | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2012 USD ($) | Jan. 31, 2013 USD ($) | Jan. 31, 2013 NOK | Dec. 31, 2012 Express, Caesar And Other Pipelay Equipment [Member] USD ($) | Dec. 31, 2012 Equipment In Australia [Member] USD ($) | Dec. 31, 2011 Equipment In Australia [Member] USD ($) | Dec. 31, 2012 Intrepid Vessel [Member] USD ($) | Dec. 31, 2012 Segment, Discontinued Operations [Member] USD ($) | Dec. 31, 2012 JP Morgan Ventures [Member] Segment, Discontinued Operations [Member] | Dec. 31, 2012 Shell [Member] Segment, Continuing Operations [Member] | Dec. 31, 2011 Shell [Member] Segment, Continuing Operations [Member] | Dec. 31, 2012 Shell [Member] Segment, Discontinued Operations [Member] | Dec. 31, 2011 Shell [Member] Segment, Discontinued Operations [Member] | Dec. 31, 2010 Shell [Member] Segment, Discontinued Operations [Member] | Dec. 31, 2010 BP Plc [Member] Segment, Continuing Operations [Member] | Dec. 31, 2010 Louis Dreyfus Energy Services [Member] Segment, Discontinued Operations [Member] | Dec. 31, 2012 Interest Rate Swaps [Member] USD ($) | Dec. 31, 2012 Foreign Exchange Forward [Member] USD ($) | Dec. 31, 2011 Foreign Exchange Forward [Member] USD ($) | Dec. 31, 2010 Foreign Exchange Forward [Member] USD ($) | Dec. 31, 2012 Convertible Senior Notes 2025 [Member] USD ($) | Dec. 31, 2012 Convertible Senior Notes 2032 [Member] USD ($) | Jan. 31, 2009 Convertible Senior Notes 2025 [Member] USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accruals for capital expenditures |  |  |  |  |  |  |  |  | $ 51,100,000 |  | $ 26,100,000 |  | $ 21,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Property Repairs and Maintenance |  |  |  |  |  |  |  |  | 38,700,000 |  | 32,300,000 |  | 29,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Computer Software, Gross | 18,500,000 |  |  |  | 18,500,000 |  |  |  | 18,500,000 |  | 18,100,000 |  |  |  |  | 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Computer Software, Amortization |  |  |  |  |  |  |  |  | (2,600,000) |  | (2,600,000) |  | (2,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment |  |  |  |  | 158,000,000 |  | 4,600,000 | 14,600,000 |  |  |  |  |  |  |  |  |  |  |  | 157,800,000 | 4,600,000 | 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 238,300,000 | 5,000,000 |  | 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit Liability, Current | 50,000,000 | [1] |  |  | 50,000,000 | [1] |  |  | 50,000,000 | [1] |  |  |  |  |  | 50,000,000 | [1] |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  |  |  | (4,893,000) |  | (1,277,000) |  | (12,474,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary loss on equity investments |  |  |  |  |  |  |  |  |  |  | 10,563,000 |  | 2,240,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  |  |  |  | 16,743,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, net | 62,935,000 |  |  |  | 62,935,000 |  |  |  | 62,935,000 |  | 62,215,000 |  | 62,494,000 | [2] |  | 62,935,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset, gross | 1,700,000 |  |  |  | 1,700,000 |  |  |  | 1,700,000 |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets with finite lives, net | 491,000 |  |  |  | 491,000 |  |  |  | 491,000 |  | 531,000 |  |  |  |  | 491,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 1,200,000 |  |  |  | 1,200,000 |  |  |  | 1,200,000 |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 100,000 |  | 100,000 |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Next Twelve Months | 100,000 |  |  |  | 100,000 |  |  |  | 100,000 |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 100,000 |  |  |  | 100,000 |  |  |  | 100,000 |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 100,000 |  |  |  | 100,000 |  |  |  | 100,000 |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 100,000 |  |  |  | 100,000 |  |  |  | 100,000 |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred dry dock expenses, net | 22,704,000 | [3] |  |  | 22,704,000 | [3] |  |  | 22,704,000 | [3] | 5,381,000 | [3] |  |  |  | 22,704,000 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drydock amortization expense |  |  |  |  |  |  |  |  | 8,600,000 |  | 7,600,000 |  | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of convertible preferred stock | 1,000,000 |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 361,402 |  |  | 1,807,011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation gain, net of tax |  |  |  |  |  |  |  |  | 7,291,000 |  | (1,002,000) |  | (10,005,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  |  |  |  |  |  |  | (500,000) |  | (2,100,000) |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax |  |  |  |  |  |  |  |  | (2,661,000) |  | 23,669,000 |  | (23,726,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax |  |  |  |  |  |  |  |  | 6,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |
Derivative Instruments, Loss Recognized in Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 | 200,000 | (2,600,000) |  |  |
Notional Amount of Interest Rate Cash Flow Hedge Derivatives | 200,000,000 |  |  |  | 200,000,000 |  |  |  | 200,000,000 |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount of Foreign Currency Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104,600,000 | 591,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.00% | 12.00% | 10.00% | 64.00% | 89.00% | 67.00% | 26.00% | 19.00% |  |  |  |  |  |  |
Subsea services to customers |  |  |  |  |  |  |  |  | 70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt discount | 31,688,000 | [4] |  |  | 31,688,000 | [4] |  |  | 31,688,000 | [4] | 9,555,000 |  |  |  |  | 31,688,000 | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,200,000
Gas and oil imbalance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas Balancing Payable, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares of Cal Dive common stock, shares |  |  | 500,000 |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on investment in Cal Dive common stock |  |  | 800,000 |  |  |  |  |  |  |  | 753,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of Cal Dive common stock |  |  | 3,600,000 |  |  |  |  |  |  |  | 3,588,000 |  |  |  | 418,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value | 5,946,000 |  |  |  | 5,946,000 |  |  |  | 5,946,000 |  | 55,000 |  |  |  |  | 5,946,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value | 16,298,000 |  |  |  | 16,298,000 |  |  |  | 16,298,000 |  | 159,000 |  |  |  |  | 16,298,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |
Convertible debt stock price trigger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38.57 | $ 32.53 |
Debt Instrument, Unamortized Discount | $ 31,688,000 | [4] |  |  | $ 31,688,000 | [4] |  |  | $ 31,688,000 | [4] | $ 9,555,000 |  |  |  |  | $ 31,688,000 | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,200,000
Debt Instrument, Convertible, Remaining Discount Amortization Period |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Reflects the cash deposit we received in association with the expected sales of our two remaining pipelay vessels, the Express and the Caesar, and other related pipelay equipment (Note 2), which is refundable in very limited circumstances. The sales of these vessels are scheduled to close and fund in two stages in 2013 following the completion of each vessel’s existing backlog of work.
[2] | In 2010, we fully impaired $16.7 million of goodwill associated with our Australian well intervention subsidiary (“WOSEA”) (see below).
[3] | The increase subsequent to December 31, 2011 reflects the costs associated with the regulatory dry docks for our Q4000, Seawell and Well Enhancer vessels during 2012.
[4] | The notes will increase to their principal amount through accretion of non-cash interest charges through March 2018 for the Convertible Senior Notes due 2032.

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