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Property And Equipment - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jan. 31, 2015 | Dec. 31, 2014 | Jan. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  |  |  | $ 13,177 | $ 17,592 | $ 13,574
Note receivable, remaining principal balance | $ 10,000 | $ 10,000 |  |  |  | $ 10,000 | 10,000 | 10,000 |
Asset impairment charges |  |  |  |  |  |  | 0 | 345,010 | 0
Gain on disposition of assets, net |  |  |  |  |  |  | $ 1,290 | 92 | $ 10,240
Spoolbase Facility [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Sales price of property and equipment |  |  |  |  | $ 45,000 |  |  |  |
Proceeds from sale of assets |  |  |  |  | 15,000 |  |  |  |
Note receivable |  |  |  |  | $ 30,000 |  |  |  |
Note receivable, interest rate | 6.00% |  |  |  |  |  | 6.00% |  |
Note receivable, periodic principal payment |  | 10,000 | $ 7,500 | $ 2,500 |  |  |  |  |
Note receivable, remaining principal balance | $ 10,000 |  |  |  |  |  | $ 10,000 |  |
Helix 534 [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Sales price of property and equipment | 2,800 |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | 205,200 |  | 205,200 |
Estimated fair value |  | 1,000 |  |  |  | 1,000 |  | 1,000 |
Write off of deferred dry dock costs |  | 9,000 |  |  |  | 9,000 |  | 9,000 |
Unrecorded gain contingency | $ 400 |  |  |  |  |  | 400 |  |
Gain on disposition of assets, net |  |  |  |  |  |  | $ 1,300 |  |
HP I [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | 133,400 |  | 133,400 |
Estimated fair value |  | $ 124,300 |  |  |  | 124,300 |  | 124,300 |
Capitalized Vessel Project Costs [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment charges to write off capitalized costs |  |  |  |  |  | $ 6,300 |  | $ 6,300 |

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