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Segment Information, Geographical Data and Major Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Total revenues $ 105,601   $ 197,094  
Operating profit (loss) 7,647   6,504  
General and administrative expenses (24,425)   (47,990)  
Depreciation and amortization 12,785   24,802  
Corporate expenses (7,910)   (14,694)  
Gain on asset dispositions, net 1,338   3,257  
Asset impairments [1] (1,215)   (7,401)  
Operating loss (140)   (12,334)  
Foreign exchange loss (1,002)   (1,350)  
Equity in net earnings (losses) of unconsolidated companies 390   (15,049)  
Interest income and other, net 2,914   2,786  
Interest and other debt costs, net (7,547)   (15,146)  
Loss before income taxes (5,385)   (41,093)  
Additions to properties and equipment 4,097   5,775  
All Other Segments        
Segment Reporting Information [Line Items]        
Operating profit (loss) 778   2,284  
Depreciation and amortization 5   10  
Operating Segments        
Segment Reporting Information [Line Items]        
Operating profit (loss) 6,869   4,220  
Depreciation and amortization 12,680   24,592  
Additions to properties and equipment 2,438   3,899  
Operating Segments | Americas        
Segment Reporting Information [Line Items]        
Operating profit (loss) 5,681   10,592  
Depreciation and amortization 3,530   6,843  
Additions to properties and equipment 1,230   2,267  
Operating Segments | Middle East/Asia Pacific        
Segment Reporting Information [Line Items]        
Operating profit (loss) 625   (1,628)  
Depreciation and amortization 2,844   5,613  
Additions to properties and equipment 1,073   1,496  
Operating Segments | Europe/Mediterranean Sea        
Segment Reporting Information [Line Items]        
Operating profit (loss) (1,142)   (4,696)  
Depreciation and amortization 2,239   4,043  
Additions to properties and equipment 135   135  
Operating Segments | West Africa        
Segment Reporting Information [Line Items]        
Operating profit (loss) 1,705   (48)  
Depreciation and amortization 4,067   8,093  
Additions to properties and equipment     1  
Corporate        
Segment Reporting Information [Line Items]        
General and administrative expenses (7,810)   (14,494)  
Depreciation and amortization 100   200  
Additions to properties and equipment [2] 1,659   1,876  
Vessel Revenues        
Segment Reporting Information [Line Items]        
Total revenues 104,174   191,668  
Vessel Revenues | Americas        
Segment Reporting Information [Line Items]        
Total revenues 32,601   58,682  
Vessel Revenues | Middle East/Asia Pacific        
Segment Reporting Information [Line Items]        
Total revenues 22,406   40,794  
Vessel Revenues | Europe/Mediterranean Sea        
Segment Reporting Information [Line Items]        
Total revenues 13,357   22,980  
Vessel Revenues | West Africa        
Segment Reporting Information [Line Items]        
Total revenues 35,810   69,212  
Vessel Revenues | Operating Segments | Americas        
Segment Reporting Information [Line Items]        
Total revenues 32,601   58,682  
Vessel Revenues | Operating Segments | Middle East/Asia Pacific        
Segment Reporting Information [Line Items]        
Total revenues 22,406   40,794  
Vessel Revenues | Operating Segments | Europe/Mediterranean Sea        
Segment Reporting Information [Line Items]        
Total revenues 13,357   22,980  
Vessel Revenues | Operating Segments | West Africa        
Segment Reporting Information [Line Items]        
Total revenues 35,810   69,212  
Other Operating Revenues        
Segment Reporting Information [Line Items]        
Total revenues [3] $ 1,427   $ 5,426  
Predecessor        
Segment Reporting Information [Line Items]        
Total revenues   $ 115,106   $ 275,855
Operating profit (loss)   (29,897)   (18,123)
General and administrative expenses   (33,059)   (74,786)
Depreciation and amortization   36,287   73,879
Corporate expenses   (15,243)   (37,564)
Gain on asset dispositions, net   3,189   9,253
Asset impairments [1]   (163,423)   (228,280)
Operating loss   (205,374)   (274,714)
Foreign exchange loss   (1,157)   (493)
Equity in net earnings (losses) of unconsolidated companies   4,517   7,358
Interest income and other, net   1,680   3,268
Reorganization items   (313,176)   (313,176)
Interest and other debt costs, net   (10,605)   (31,613)
Loss before income taxes   (524,115)   (609,370)
Additions to properties and equipment   1,627   9,700
Predecessor | All Other Segments        
Segment Reporting Information [Line Items]        
Operating profit (loss)   55   (170)
Depreciation and amortization   854   1,709
Predecessor | Operating Segments        
Segment Reporting Information [Line Items]        
Operating profit (loss)   (29,952)   (17,953)
Depreciation and amortization   34,892   71,065
Additions to properties and equipment   949   2,068
Predecessor | Operating Segments | Americas        
Segment Reporting Information [Line Items]        
Operating profit (loss)   (15,699)   14,919
Depreciation and amortization   10,748   22,045
Additions to properties and equipment   27   27
Predecessor | Operating Segments | Middle East/Asia Pacific        
Segment Reporting Information [Line Items]        
Operating profit (loss)   (1,316)   (7,480)
Depreciation and amortization   7,746   16,245
Additions to properties and equipment   648   1,673
Predecessor | Operating Segments | Europe/Mediterranean Sea        
Segment Reporting Information [Line Items]        
Operating profit (loss)   (10,163)   (17,265)
Depreciation and amortization   6,803   13,364
Predecessor | Operating Segments | West Africa        
Segment Reporting Information [Line Items]        
Operating profit (loss)   (2,774)   (8,127)
Depreciation and amortization   9,595   19,411
Additions to properties and equipment   274   368
Predecessor | Corporate        
Segment Reporting Information [Line Items]        
General and administrative expenses   (14,702)   (36,459)
Depreciation and amortization   541   1,105
Additions to properties and equipment [2]   678   7,632
Predecessor | Vessel Revenues        
Segment Reporting Information [Line Items]        
Total revenues   112,257   269,162
Predecessor | Vessel Revenues | Americas        
Segment Reporting Information [Line Items]        
Total revenues   31,887   112,420
Predecessor | Vessel Revenues | Middle East/Asia Pacific        
Segment Reporting Information [Line Items]        
Total revenues   27,766   54,444
Predecessor | Vessel Revenues | Europe/Mediterranean Sea        
Segment Reporting Information [Line Items]        
Total revenues   11,031   21,197
Predecessor | Vessel Revenues | West Africa        
Segment Reporting Information [Line Items]        
Total revenues   41,573   81,101
Predecessor | Vessel Revenues | Operating Segments | Americas        
Segment Reporting Information [Line Items]        
Total revenues   31,887   112,420
Predecessor | Vessel Revenues | Operating Segments | Middle East/Asia Pacific        
Segment Reporting Information [Line Items]        
Total revenues   27,766   54,444
Predecessor | Vessel Revenues | Operating Segments | Europe/Mediterranean Sea        
Segment Reporting Information [Line Items]        
Total revenues   11,031   21,197
Predecessor | Vessel Revenues | Operating Segments | West Africa        
Segment Reporting Information [Line Items]        
Total revenues   41,573   81,101
Predecessor | Other Operating Revenues        
Segment Reporting Information [Line Items]        
Total revenues [3]   $ 2,849   $ 6,693
[1] Refer to Note (14) for additional information regarding asset impairment.
[2] Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not yet been assigned to a non-corporate reporting segment as of the dates presented.
[3] Included in other operating revenues for the quarter and six months ended June 30, 2017, were $0.5 million and $0.8 million, respectively, of revenues related to the company’s subsea business. The eight ROVs representing substantially all of the company’s subsea assets were sold in December 2017.