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Business Segment Information - Summary Of Financial Data By Segment (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Jan. 31, 2014 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  | $ 128,031 | $ 161,245 | $ 107,267 | $ 91,039 | $ 157,683 | $ 182,462 | $ 166,016 | $ 189,641 | $ 487,582 | $ 695,802 | $ 1,107,156
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | (63,235) | (307,360) | 261,756
Net interest expense |  |  |  |  |  |  |  |  |  |  | 31,239 | 26,914 | 17,859
Equity in earnings (losses) of investments |  |  |  |  |  |  |  |  |  |  | (2,166) | (124,345) | 879
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | (93,915) | (478,170) | 262,521
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | (12,470) | (101,190) | 66,971
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 186,487 | 320,311 | 336,912
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 114,187 | 120,401 | 109,345
Asset impairment charges |  |  |  |  |  |  |  |  |  |  | 0 | 345,010 | 0
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  | 45,107 | 16,399 | 0
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  | 1,290 | 92 | 10,240
Unrealized losses on foreign exchange contracts |  |  |  |  |  |  | 19,000 |  |  |  | (8,800) | 18,281 | 1,320
Proceeds from insurance reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 7,200
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | 123,600 | 187,700 | 362,700
Helix 534 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 205,200 |  |  |  |  | 205,200 |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  | 1,300 |  |
Capitalized Vessel Project Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges to write off capitalized costs |  |  |  |  |  |  | 6,300 |  |  |  |  | 6,300 |
HP I [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 133,400 |  |  |  |  | 133,400 |
Reportable Segments [Member] | Spoolbase Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  | $ 10,500 |  |  |  |  |  |  |  |  |  |  |
Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | (39,356) | (54,473) | (74,450)
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | (372) | (98) | (921)
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | (39,384) | (33,866) | (51,600)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | (70,890) | (55,475) | (51,862)
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | (26,146) | (19,423) | (19,138)
Capital expenditures |  |  |  |  |  |  |  |  |  |  | (199) | (135) | 1,060
Corporate and Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest expense |  |  |  |  |  |  |  |  |  |  | 31,373 | 26,602 | 17,732
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 5,995 | 6,242 | 6,019
Other income |  |  |  |  |  |  |  |  |  |  |  |  | 16,900
Proceeds from insurance reimbursement |  |  |  |  |  |  |  |  |  |  |  |  | 7,200
Well Intervention [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  | $ 16,400 |  |  |  | 0 | 16,399 |
Well Intervention [Member] | United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | 16,400 |
Well Intervention [Member] | Helix 534 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 205,200 |
Gain on disposition of assets, net | $ 1,300 |  |  |  |  |  |  |  |  |  |  |  |
Well Intervention [Member] | Capitalized Vessel Project Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges to write off capitalized costs |  |  |  |  |  |  |  |  |  |  |  | 6,300 |
Well Intervention [Member] | Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | 294,000 | 373,301 | 667,849
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | 14,910 | (194,381) | 204,810
Net interest expense |  |  |  |  |  |  |  |  |  |  | (109) | (102) | (252)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | 18,813 | (193,572) | 211,725
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | 12,531 | (1,230) | 50,102
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 185,892 | 307,879 | 283,635
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 68,392 | 66,095 | 57,570
Well Intervention [Member] | Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | (8,442) | (22,855) | (29,875)
Robotics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  | $ 45,100 |  |  |  |  |  |  |  | 45,107 | 0 |
Unrealized losses on foreign exchange contracts |  |  |  |  |  |  |  |  |  |  |  | 18,300 |
Robotics [Member] | Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | 160,580 | 301,026 | 420,224
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | (72,250) | 27,832 | 68,329
Net interest expense |  |  |  |  |  |  |  |  |  |  | (25) | 29 | (5)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | (73,533) | 2,454 | 61,025
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | (9,948) | 515 | 21,612
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 720 | 10,700 | 51,348
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 25,848 | 26,724 | 24,478
Robotics [Member] | Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | (30,914) | (31,618) | (44,575)
Production Facilities [Member] | HP I [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 133,400 |
Production Facilities [Member] | Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | 72,358 | 75,948 | 93,175
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | 33,861 | (106,847) | 41,138
Net interest expense |  |  |  |  |  |  |  |  |  |  | 0 | 385 | 384
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | 31,695 | (231,577) | 41,633
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | 11,093 | (81,052) | 14,395
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 74 | 1,867 | 869
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 13,952 | 21,340 | 21,278
Other [Member] | Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 358

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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