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Commitments And Contingencies (Details) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2010 USD ($) | Apr. 30, 2010 AUD | Mar. 31, 2011 USD ($) | Jun. 30, 2010 USD ($) | Mar. 31, 2010 USD ($) | Mar. 31, 2009 USD ($) | Sep. 30, 2010 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2008 USD ($) | Mar. 31, 2009 AUD | Dec. 31, 2011 Q4000, Helix Producer I And Well Enhancer [Member] USD ($) | Dec. 31, 2011 Intrepid, Seawell And Express [Member] USD ($) | Dec. 31, 2011 Caesar [Member] USD ($) | Dec. 31, 2011 P&I And General Liability [Member] USD ($) | Dec. 31, 2011 Maritime Employers Liability [Member] USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future minimum rentals |  |  |  |  |  |  |  | $ 54,400,000 |  |  |  |  |  |  |  |  |
Future minimum rent due in 2012 |  |  |  |  |  |  |  | 42,800,000 |  |  |  |  |  |  |  |  |
Future minimum rent due in 2013 |  |  |  |  |  |  |  | 7,600,000 |  |  |  |  |  |  |  |  |
Future minimum rent due in 2014 |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |
Future minimum rent due in 2015 |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |
Future minimum rent due in 2016 |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |
Future minimum rent thereafter |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |
Rental expense |  |  |  |  |  |  |  | 62,200,000 | 66,200,000 | 89,900,000 |  |  |  |  |  |  |
Insurance deductibles |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 500,000 | 375,000 | 100,000 | 100,000
Insurance annual aggregate deductible |  |  |  |  |  |  |  | 1,250,000 |  |  |  |  |  |  |  |  | 1,000,000
Insurance liability limits |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |
Self-insured retention for employees |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |
Liability for damages |  |  |  |  |  |  |  |  |  |  |  | 32,000,000 |  |  |  |  |
Approximate actual damages |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |
Damage claims paid |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of claims |  |  |  |  | 17,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Payments for litigation settlements |  |  |  |  | 13,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining trade receivable write off |  |  |  |  | 3,700,000 |  |  |  | 3,700,000 |  |  |  |  |  |  |  |
Trade receivables collected |  |  |  |  |  |  |  | 303,000,000 |  |  |  |  |  |  |  |  |
Trade receivable allowance | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value added tax assessment |  |  |  |  |  |  |  | 28,000,000 |  |  |  |  |  |  |  |  |
Estimated loss under the contract |  |  |  |  |  |  |  |  |  | 15,800,000 | 9,000,000 |  |  |  |  |  |
Settlement of obligation under the contract |  |  |  |  |  |  |  |  |  | 12,700,000 |  |  |  |  |  |  |
Previously accrued loss |  |  | 200,000 |  |  |  | 12,000,000 |  | 30,000,000 | 3,700,000 |  |  |  |  |  |  |
Loss on contract termination |  |  |  | $ 5,500,000 |  |  |  |  |  |  | $ 7,200,000 |  |  |  |  |  |

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