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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 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 163,266 | $ 163,260 | $ 150,329 | $ 104,528 | $ 128,031 | $ 161,245 | $ 107,267 | $ 91,039 | $ 581,383 | $ 487,582 | $ 695,802
Income (loss) from operations |  |  |  |  |  |  |  |  |  | (1,130) | (63,235) | (307,360)
Net interest expense |  |  |  |  |  |  |  |  |  | 18,778 | 31,239 | 26,914
Equity in losses of investments |  |  |  |  |  |  |  |  |  | (2,368) | (2,166) | (124,345)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | (20,372) | (93,915) | (478,170)
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | (50,424) | (12,470) | (101,190)
Capital expenditures |  |  |  |  |  |  |  |  |  | 231,127 | 186,487 | 320,311
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 108,745 | 114,187 | 120,401
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  | (39) | 1,290 | 92
Asset impairment charges |  |  |  |  |  |  |  |  |  | 0 | 0 | 345,010
Goodwill impairment charge |  |  |  |  |  |  |  |  |  | 0 | 45,107 | 16,399
Unrealized losses on foreign exchange contracts |  |  |  |  |  |  |  |  |  | (4,423) | (8,800) | 18,281
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 156,000 | 123,600 | 187,700
Helix 534 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net | $ 1,300 |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 205,200
Capitalized Vessel Project Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges to write off capitalized costs |  |  |  |  |  |  |  |  |  |  |  | 6,300
HP I [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 133,400
Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | (42,065) | (39,356) | (54,473)
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 884 | (372) | (98)
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  | (40,630) | (39,384) | (33,866)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | (54,853) | (70,890) | (55,475)
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | (17,550) | (26,146) | (19,423)
Capital expenditures |  |  |  |  |  |  |  |  |  | 125 | (199) | (135)
Corporate and Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net interest expense |  |  |  |  |  |  |  |  |  | 18,964 | 31,373 | 26,602
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2,882 | 5,995 | 6,242
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] |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net | $ 1,300 |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 205,200
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 |  |  |  |  |  |  |  |  |  | 406,341 | 294,000 | 373,301
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 52,733 | 14,910 | (194,381)
Net interest expense |  |  |  |  |  |  |  |  |  | (156) | (109) | (102)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 48,948 | 18,813 | (193,572)
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | (29,934) | 12,531 | (1,230)
Capital expenditures |  |  |  |  |  |  |  |  |  | 230,354 | 185,892 | 307,879
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 68,301 | 68,392 | 66,095
Well Intervention [Member] | Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | (11,489) | (8,442) | (22,855)
Robotics [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  | $ 45,100 |  |  |  |  |  |  |  |  | 45,100 |
Unrealized losses on foreign exchange contracts |  |  |  |  |  |  |  |  |  |  |  | 18,300
Robotics [Member] | Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 152,755 | 160,580 | 301,026
Income (loss) from operations |  |  |  |  |  |  |  |  |  | (42,289) | (72,250) | 27,832
Net interest expense |  |  |  |  |  |  |  |  |  | (30) | (25) | 29
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | (40,271) | (73,533) | 2,454
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | (11,972) | (9,948) | 515
Capital expenditures |  |  |  |  |  |  |  |  |  | 648 | 720 | 10,700
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 23,626 | 25,848 | 26,724
Robotics [Member] | Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | (30,576) | (30,914) | (31,618)
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 |  |  |  |  |  |  |  |  |  | 64,352 | 72,358 | 75,948
Income (loss) from operations |  |  |  |  |  |  |  |  |  | 28,172 | 33,861 | (106,847)
Net interest expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 385
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 25,804 | 31,695 | (231,577)
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 9,032 | 11,093 | (81,052)
Capital expenditures |  |  |  |  |  |  |  |  |  | 0 | 74 | 1,867
Depreciation and amortization |  |  |  |  |  |  |  |  |  | $ 13,936 | $ 13,952 | $ 21,340

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