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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