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Commitments And Contingencies (Narrative) (Details) (USD $) | 12 Months Ended | 36 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2009 | Dec. 31, 2013 Annual Aggregate [Member] | Sep. 30, 2013 Q7000 [Member] | Dec. 31, 2013 Q7000 [Member] | Dec. 31, 2013 Q7000 [Member] Vessel Delivery [Member] | Dec. 31, 2013 Q7000 [Member] Contract Signing [Member] | Dec. 31, 2013 Q4000 Helix Producer I And Well Enhancer [Member] | Aug. 31, 2012 Helix 534 [Member] | Dec. 31, 2013 Helix 534 [Member] | Mar. 31, 2012 Q5000 [Member] | Dec. 31, 2013 Q5000 [Member] | Dec. 31, 2013 Seawell And H534 [Member] | Dec. 31, 2013 General Liability [Member] Per Occurance [Member] | Dec. 31, 2013 Maritime Employers Liability [Member] Per Occurance [Member] | Dec. 31, 2013 Maritime Employers Liability [Member] Annual Aggregate [Member]
Long-term Purchase Commitment, Amount |  |  |  |  |  | $ 346,000,000 |  |  |  |  |  |  | $ 386,500,000 |  |  |  |  |
Long Term Purchase Commitment Percentage |  |  |  |  |  |  |  | 80.00% | 20.00% |  |  |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  | 69,200,000 |  |  |  | 85,000,000 |  |  | 173,800,000 |  |  |  |
Property and equipment | 1,959,783,000 | 2,051,796,000 |  |  |  |  | 76,700,000 |  |  |  |  | 202,800,000 |  | 210,600,000 |  |  |  |
Operating Leases, Rent Expense, Net | 102,100,000 | 85,000,000 | 62,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Rent Expense, Sublease Rentals | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables collected |  |  |  | 303,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Deductibles |  |  |  |  | 5,000,000 |  |  |  |  | 1,000,000 |  |  |  |  | 500,000 | 100,000 | 100,000 | 1,000,000
Insurance liability limits | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured retention for employees | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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