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Segment Information, Geographical Data and Major Customers (Detail) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Jul. 31, 2017
Sep. 30, 2018
Segment Reporting Information [Line Items]          
Total revenues   $ 74,300 $ 99,192   $ 296,286
Operating profit (loss)   (922) 2,852   9,356
General and administrative expenses   (16,246) (25,546)   (73,536)
Depreciation and amortization   8,142 13,390   38,192
Corporate expenses   (4,864) (9,514)   (24,208)
Gain (loss) on asset dispositions, net   4 (1,571)   1,686
Asset impairments     (16,853) [1]   (24,254) [2]
Operating loss   (5,782) (25,086)   (37,420)
Foreign exchange gain (loss)   (58) 1   (1,349)
Equity in net earnings (losses) of unconsolidated companies   1,305 56   (14,993)
Interest income and other, net   873 2,709   5,495
Reorganization items   (1,880)      
Interest and other debt costs, net   (5,240) (7,585)   (22,731)
Loss before income taxes   (10,782) (29,905)   (70,998)
Additions to properties and equipment   589 3,341   9,116
All Other Segments          
Segment Reporting Information [Line Items]          
Operating profit (loss)   809 485   2,767
Depreciation and amortization   412 5   16
Operating Segments          
Segment Reporting Information [Line Items]          
Operating profit (loss)   (1,731) 2,367   6,589
Depreciation and amortization   7,663 13,286   37,877
Additions to properties and equipment   536 1,186   5,064
Operating Segments | Americas          
Segment Reporting Information [Line Items]          
Operating profit (loss)   (2,651) 1,212   11,804
Depreciation and amortization   2,295 3,858   10,700
Additions to properties and equipment     564   2,831
Operating Segments | Middle East/Asia Pacific          
Segment Reporting Information [Line Items]          
Operating profit (loss)   944 (701)   (2,329)
Depreciation and amortization   1,807 2,939   8,552
Additions to properties and equipment   377 568   2,064
Operating Segments | Europe/Mediterranean Sea          
Segment Reporting Information [Line Items]          
Operating profit (loss)   (711) (2,056)   (6,753)
Depreciation and amortization   1,154 2,313   6,356
Additions to properties and equipment         134
Operating Segments | West Africa          
Segment Reporting Information [Line Items]          
Operating profit (loss)   687 3,912   3,867
Depreciation and amortization   2,407 4,176   12,269
Additions to properties and equipment   159 54   35
Corporate          
Segment Reporting Information [Line Items]          
General and administrative expenses   (4,797) [3],[4] (9,415) [4]   (23,909) [3]
Depreciation and amortization   67 99   299
Additions to properties and equipment   53 [5],[6] 2,155 [5]   4,052 [6]
Vessel Revenues          
Segment Reporting Information [Line Items]          
Total revenues   70,571 97,011   288,679
Vessel Revenues | Americas          
Segment Reporting Information [Line Items]          
Total revenues   17,449 [7] 28,039   86,721 [7]
Vessel Revenues | Middle East/Asia Pacific          
Segment Reporting Information [Line Items]          
Total revenues   16,669 19,927   60,721
Vessel Revenues | Europe/Mediterranean Sea          
Segment Reporting Information [Line Items]          
Total revenues   8,860 12,566   35,546
Vessel Revenues | West Africa          
Segment Reporting Information [Line Items]          
Total revenues   27,593 36,479   105,691
Vessel Revenues | Operating Segments | Americas          
Segment Reporting Information [Line Items]          
Total revenues   17,449 28,039   86,721
Vessel Revenues | Operating Segments | Middle East/Asia Pacific          
Segment Reporting Information [Line Items]          
Total revenues   16,669 19,927   60,721
Vessel Revenues | Operating Segments | Europe/Mediterranean Sea          
Segment Reporting Information [Line Items]          
Total revenues   8,860 12,566   35,546
Vessel Revenues | Operating Segments | West Africa          
Segment Reporting Information [Line Items]          
Total revenues   27,593 36,479   105,691
Other Operating Revenues          
Segment Reporting Information [Line Items]          
Total revenues   $ 3,729 [8],[9] $ 2,181 [9]   $ 7,607 [8]
Predecessor          
Segment Reporting Information [Line Items]          
Total revenues $ 36,263     $ 312,118  
Operating profit (loss) (14,718)     (32,840)  
General and administrative expenses (8,773)     (83,559)  
Depreciation and amortization 11,160     85,039  
Corporate expenses (3,003)     (40,567)  
Gain (loss) on asset dispositions, net 372     9,625  
Asset impairments (21,325) [1]     (249,606) [2]  
Operating loss (38,674)     (313,388)  
Foreign exchange gain (loss) (2,024)     (2,516)  
Equity in net earnings (losses) of unconsolidated companies 269     7,627  
Interest income and other, net 704     3,974  
Reorganization items (1,083,729)     (1,396,905)  
Interest and other debt costs, net (574)     (32,188)  
Loss before income taxes (1,124,028)     (1,733,396)  
Additions to properties and equipment 638     10,338  
Predecessor | All Other Segments          
Segment Reporting Information [Line Items]          
Operating profit (loss) 821     651  
Depreciation and amortization 285     1,995  
Predecessor | Operating Segments          
Segment Reporting Information [Line Items]          
Operating profit (loss) (15,539)     (33,491)  
Depreciation and amortization 10,712     81,776  
Additions to properties and equipment 495     2,563  
Predecessor | Operating Segments | Americas          
Segment Reporting Information [Line Items]          
Operating profit (loss) (6,850)     8,069  
Depreciation and amortization 3,197     25,242  
Additions to properties and equipment       27  
Predecessor | Operating Segments | Middle East/Asia Pacific          
Segment Reporting Information [Line Items]          
Operating profit (loss) (118)     (7,597)  
Depreciation and amortization 2,221     18,466  
Additions to properties and equipment 394     2,067  
Predecessor | Operating Segments | Europe/Mediterranean Sea          
Segment Reporting Information [Line Items]          
Operating profit (loss) (2,517)     (19,783)  
Depreciation and amortization 2,257     15,621  
Predecessor | Operating Segments | West Africa          
Segment Reporting Information [Line Items]          
Operating profit (loss) (6,054)     (14,180)  
Depreciation and amortization 3,037     22,447  
Additions to properties and equipment 101     469  
Predecessor | Corporate          
Segment Reporting Information [Line Items]          
General and administrative expenses (2,840) [4]     (39,299) [3]  
Depreciation and amortization 163     1,268  
Additions to properties and equipment 143 [5]     7,775 [6]  
Predecessor | Vessel Revenues          
Segment Reporting Information [Line Items]          
Total revenues 34,340     303,501  
Predecessor | Vessel Revenues | Americas          
Segment Reporting Information [Line Items]          
Total revenues 8,961     121,380 [7]  
Predecessor | Vessel Revenues | Middle East/Asia Pacific          
Segment Reporting Information [Line Items]          
Total revenues 8,547     62,991  
Predecessor | Vessel Revenues | Europe/Mediterranean Sea          
Segment Reporting Information [Line Items]          
Total revenues 4,435     25,631  
Predecessor | Vessel Revenues | West Africa          
Segment Reporting Information [Line Items]          
Total revenues 12,397     93,499  
Predecessor | Vessel Revenues | Operating Segments | Americas          
Segment Reporting Information [Line Items]          
Total revenues 8,961     121,380  
Predecessor | Vessel Revenues | Operating Segments | Middle East/Asia Pacific          
Segment Reporting Information [Line Items]          
Total revenues 8,547     62,991  
Predecessor | Vessel Revenues | Operating Segments | Europe/Mediterranean Sea          
Segment Reporting Information [Line Items]          
Total revenues 4,435     25,631  
Predecessor | Vessel Revenues | Operating Segments | West Africa          
Segment Reporting Information [Line Items]          
Total revenues 12,397     93,499  
Predecessor | Other Operating Revenues          
Segment Reporting Information [Line Items]          
Total revenues $ 1,923 [9]     $ 8,617 [8]  
[1] Refer to Note (14) for additional information regarding asset impairment.
[2] Refer to Note (14) for additional information regarding asset impairment.
[3] Included in corporate general and administrative expenses for the period from January 1, 2017 through July 31, 2017 (Predecessor), are restructuring-related professional services costs of $23.4 million. Included in corporate general and administrative expenses for the nine month period ended September 30, 2018 (Successor), are professional services costs related the proposed combination with GulfMark of $4.7 million.
[4] Included in corporate general and administrative expenses for the three month period ended September 30, 2018 (Successor), are professional services costs related the proposed combination with GulfMark of $3.2 million.
[5] Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not been assigned to a non-corporate reporting segment as of the date presented.
[6] 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.
[7] Included in Americas and total vessel revenues for the period January 1, 2017 through July 31, 2017 (Predecessor), is $39.1 million of revenue related to the early cancellation of a long-term vessel charter contract.
[8] Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from January 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $1.1 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.
[9] Included in other operating revenues for the period from August 1, 2017 through September 30, 2017 (Successor) and the period from July 1, 2017 through July 31, 2017 (Predecessor), were $1.6 million and $0.4 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.