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Segment Information, Geographical Data and Major Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Vessel revenues $ 87,494  
Other operating revenues [1] 3,999  
Total revenues 91,493  
Operating profit (loss) (1,143)  
General and administrative expenses (23,565)  
Depreciation and amortization 12,017  
Corporate expenses (6,784)  
Gain on asset dispositions, net 1,919  
Asset impairments [2] (6,186)  
Operating loss (12,194)  
Foreign exchange gain (loss) (348)  
Equity in net earnings (losses) of unconsolidated companies (15,439)  
Interest income and other, net (128)  
Interest and other debt costs, net (7,599)  
Loss before income taxes (35,708)  
Additions to properties and equipment 1,678  
Americas    
Segment Reporting Information [Line Items]    
Vessel revenues 26,081  
Middle East/Asia Pacific    
Segment Reporting Information [Line Items]    
Vessel revenues 18,388  
Europe/Mediterranean Sea    
Segment Reporting Information [Line Items]    
Vessel revenues 9,623  
West Africa    
Segment Reporting Information [Line Items]    
Vessel revenues 33,402  
All Other Segments    
Segment Reporting Information [Line Items]    
Operating profit (loss) 1,506  
Depreciation and amortization 5  
Predecessor    
Segment Reporting Information [Line Items]    
Vessel revenues   $ 156,905
Other operating revenues [1]   3,844
Total revenues   160,749
Operating profit (loss)   11,774
General and administrative expenses   (41,727)
Depreciation and amortization   37,592
Corporate expenses   (22,321)
Gain on asset dispositions, net   6,064
Asset impairments [2]   (64,857)
Operating loss   (69,340)
Foreign exchange gain (loss)   664
Equity in net earnings (losses) of unconsolidated companies   2,841
Interest income and other, net   1,588
Interest and other debt costs, net   (21,008)
Loss before income taxes   (85,255)
Additions to properties and equipment   8,073
Predecessor | Americas    
Segment Reporting Information [Line Items]    
Vessel revenues   80,533
Predecessor | Middle East/Asia Pacific    
Segment Reporting Information [Line Items]    
Vessel revenues   26,678
Predecessor | Europe/Mediterranean Sea    
Segment Reporting Information [Line Items]    
Vessel revenues   10,166
Predecessor | West Africa    
Segment Reporting Information [Line Items]    
Vessel revenues   39,528
Predecessor | All Other Segments    
Segment Reporting Information [Line Items]    
Operating profit (loss)   (225)
Depreciation and amortization   855
Operating Segments    
Segment Reporting Information [Line Items]    
Operating profit (loss) (2,649)  
Depreciation and amortization 11,912  
Additions to properties and equipment 1,461  
Operating Segments | Americas    
Segment Reporting Information [Line Items]    
Vessel revenues 26,081  
Operating profit (loss) 4,911  
Depreciation and amortization 3,313  
Additions to properties and equipment 1,037  
Operating Segments | Middle East/Asia Pacific    
Segment Reporting Information [Line Items]    
Vessel revenues 18,388  
Operating profit (loss) (2,253)  
Depreciation and amortization 2,769  
Additions to properties and equipment 423  
Operating Segments | Europe/Mediterranean Sea    
Segment Reporting Information [Line Items]    
Vessel revenues 9,623  
Operating profit (loss) (3,554)  
Depreciation and amortization 1,804  
Operating Segments | West Africa    
Segment Reporting Information [Line Items]    
Vessel revenues 33,402  
Operating profit (loss) (1,753)  
Depreciation and amortization 4,026  
Additions to properties and equipment 1  
Operating Segments | Predecessor    
Segment Reporting Information [Line Items]    
Operating profit (loss)   11,999
Depreciation and amortization   36,173
Additions to properties and equipment   1,119
Operating Segments | Predecessor | Americas    
Segment Reporting Information [Line Items]    
Vessel revenues   80,533
Operating profit (loss)   30,618
Depreciation and amortization   11,297
Operating Segments | Predecessor | Middle East/Asia Pacific    
Segment Reporting Information [Line Items]    
Vessel revenues   26,678
Operating profit (loss)   (6,164)
Depreciation and amortization   8,499
Additions to properties and equipment   1,025
Operating Segments | Predecessor | Europe/Mediterranean Sea    
Segment Reporting Information [Line Items]    
Vessel revenues   10,166
Operating profit (loss)   (7,102)
Depreciation and amortization   6,561
Operating Segments | Predecessor | West Africa    
Segment Reporting Information [Line Items]    
Vessel revenues   39,528
Operating profit (loss)   (5,353)
Depreciation and amortization   9,816
Additions to properties and equipment   94
Corporate    
Segment Reporting Information [Line Items]    
General and administrative expenses (6,684)  
Depreciation and amortization 100  
Additions to properties and equipment [3] $ 217  
Corporate | Predecessor    
Segment Reporting Information [Line Items]    
General and administrative expenses   (21,757)
Depreciation and amortization   564
Additions to properties and equipment [3]   $ 6,954
[1] Included in other operating revenues for the quarter ended March 31, 2017, were $0.3 million 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.
[2] Refer to Note (13) for additional information regarding asset impairment charges.
[3] Included in Corporate are additions to properties and equipment relating to vessels currently under construction which have not yet been assigned to a non-corporate reporting segment as of the dates presented.