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Segment Information, Geographical Data and Major Customers (Detail) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]                          
Total revenues                   $ 178,753   $ 406,520  
Operating profit (loss)                   1,277   6,066  
Corporate expenses                   (14,989)   (42,972)  
Gain on asset dispositions, net                   6,616   10,624  
Impairment of due from affiliate     $ (20,083)                 (20,083)  
Asset impairments     (36,878) $ (16,853) $ (1,215) $ (6,186) $ (16,777)     (16,777) [1]   (61,132) [1]  
Operating loss   $ (5,782) (70,077) $ (25,086) $ (140) $ (12,194) (18,091)     (23,873)   (107,497)  
Foreign exchange gain (loss)                   (407)   106  
Equity in net earnings (losses) of unconsolidated companies                   2,130   (18,864)  
Interest income and other, net                   2,771   11,294  
Reorganization items                   (4,299)      
Loss on early extinguishment of debt                       (8,119)  
Interest and other debt costs                   (13,009)   (30,439)  
Loss before income taxes                   (36,687)   (153,519)  
Depreciation and amortization                   20,337   58,293  
Additions to properties and equipment                   9,834   21,391  
Assets     1,827,739       1,759,595     1,759,595   1,827,739  
Investments in, at equity, and advances to unconsolidated companies     1,039       29,216     29,216   1,039  
All Other Segments                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                   1,614   3,742  
Depreciation and amortization                   827   21  
Assets     7,440       2,443     2,443   7,440  
Operating Segments                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                   (337)   2,324  
Operating Segments | Americas                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                   (1,599)   8,860  
Depreciation and amortization                   5,767   16,047  
Additions to properties and equipment                   144   3,771  
Assets [2]     380,168       164,958     164,958   380,168  
Operating Segments | Middle East/Asia Pacific                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                   451   (4,417)  
Depreciation and amortization                   4,716   11,871  
Additions to properties and equipment                   2,596   2,982  
Assets [2]     233,611       48,268     48,268   233,611  
Operating Segments | Europe/Mediterranean Sea                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                   (1,497)   (9,359)  
Depreciation and amortization                   2,794   11,385  
Additions to properties and equipment                       185  
Assets [2]     316,524       171,156     171,156   316,524  
Operating Segments | West Africa Segment                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                   2,308   7,240  
Depreciation and amortization                   6,067   16,612  
Additions to properties and equipment                   195   10,135  
Assets [2]     483,234       864,300     864,300   483,234  
Corporate                          
Segment Reporting Information [Line Items]                          
Depreciation and amortization                   166   2,357  
Additions to properties and equipment                   6,899   4,318  
Assets [3]     $ 405,723       $ 479,254     479,254   405,723  
Service | Operating Segments                          
Segment Reporting Information [Line Items]                          
Total revenues                   171,884   397,206  
Service | Operating Segments | Americas                          
Segment Reporting Information [Line Items]                          
Total revenues                   45,784   118,534  
Service | Operating Segments | Middle East/Asia Pacific                          
Segment Reporting Information [Line Items]                          
Total revenues                   39,845   80,195  
Service | Operating Segments | Europe/Mediterranean Sea                          
Segment Reporting Information [Line Items]                          
Total revenues                   19,895   56,263  
Service | Operating Segments | West Africa Segment                          
Segment Reporting Information [Line Items]                          
Total revenues                   66,360   142,214  
Other Operating Revenues                          
Segment Reporting Information [Line Items]                          
Total revenues                   $ 6,869   $ 9,314  
Predecessor                          
Segment Reporting Information [Line Items]                          
Total revenues                 $ 151,369   $ 440,862   $ 601,611
Operating profit (loss)                 (44,615)       (59,380)
Corporate expenses                 (18,246)       (57,845)
Gain on asset dispositions, net                 3,561       24,099
Asset impairments $ (21,325)             $ (163,423) (184,748) [1]       (484,727) [1]
Operating loss (38,674)             $ (205,374) (244,048)   (508,513)   (577,853)
Foreign exchange gain (loss)                 (3,181)       (1,638)
Equity in net earnings (losses) of unconsolidated companies                 4,786       5,710
Interest income and other, net                 2,384       5,193
Reorganization items                 (1,396,905)        
Interest and other debt costs                 (11,179)       (75,026)
Loss before income taxes                 (1,648,143)   $ (558,359)   (643,614)
Depreciation and amortization                 47,447       167,291
Additions to properties and equipment                 2,265       30,547
Assets 3,884,669               3,884,669       4,190,699
Investments in, at equity, and advances to unconsolidated companies 49,367               49,367       45,115
Predecessor | All Other Segments                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                 876       (1,548)
Depreciation and amortization                 1,139       4,430
Assets 20,392               20,392       21,580
Predecessor | Operating Segments                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                 (45,491)       (57,832)
Predecessor | Operating Segments | Americas                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                 (22,549)       18,873
Depreciation and amortization                 13,945       48,814
Additions to properties and equipment                 27       93
Assets [2] 714,891               714,891       779,778
Predecessor | Operating Segments | Middle East/Asia Pacific                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                 (1,434)       (25,310)
Depreciation and amortization                 9,967       40,849
Additions to properties and equipment                 1,042       1,612
Assets [2] 424,896               424,896       583,385
Predecessor | Operating Segments | Europe/Mediterranean Sea                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                 (12,680)       (26,733)
Depreciation and amortization                 9,060       26,538
Assets [2] 597,819               597,819       588,519
Predecessor | Operating Segments | West Africa Segment                          
Segment Reporting Information [Line Items]                          
Operating profit (loss)                 (8,828)       (24,662)
Depreciation and amortization                 12,632       44,204
Additions to properties and equipment                 375       743
Assets [2] 1,277,552               1,277,552       1,308,836
Predecessor | Corporate                          
Segment Reporting Information [Line Items]                          
Depreciation and amortization                 704       2,456
Additions to properties and equipment                 821       28,099
Assets [3] $ 799,752               799,752       863,486
Predecessor | Service | Operating Segments                          
Segment Reporting Information [Line Items]                          
Total revenues                 146,597       583,816
Predecessor | Service | Operating Segments | Americas                          
Segment Reporting Information [Line Items]                          
Total revenues                 40,848       239,843
Predecessor | Service | Operating Segments | Middle East/Asia Pacific                          
Segment Reporting Information [Line Items]                          
Total revenues                 36,313       114,618
Predecessor | Service | Operating Segments | Europe/Mediterranean Sea                          
Segment Reporting Information [Line Items]                          
Total revenues                 15,466       42,667
Predecessor | Service | Operating Segments | West Africa Segment                          
Segment Reporting Information [Line Items]                          
Total revenues                 53,970       186,688
Predecessor | Other Operating Revenues                          
Segment Reporting Information [Line Items]                          
Total revenues                 $ 4,772       $ 17,795
[1] The twelve months ended December 31, 2018, the period August 1, 2017 through December 31, 2017 and the twelve months ended March 31, 2017 included $3.5 million, $2.3 million and $2.2 million respectively, of impairments related to inventory and other non-vessel assets. There were no impairments to non-vessel assets during the period April 1, 2017 through July 31, 2017.
[2] Marine support services are conducted worldwide with assets that are highly mobile. Revenues are principally derived from offshore service vessels, which regularly and routinely move from one operating area to another, often to and from offshore operating areas in different continents. Because of this asset mobility, revenues and long-lived assets attributable to our international marine operations in any one country are not material.
[3] Included in Corporate are vessels currently under construction which had not yet been assigned to a non-corporate reporting segment. The vessel construction costs will be reported in Corporate until the earlier of the vessels being assigned to a non-corporate reporting segment or the vessels’ delivery. There were no vessels under construction at December 31, 2018. At December 31, 2017 (Successor), July 31, 2017 (Predecessor) and March 31, 2017 (Predecessor), was $9.3 million, $47.5 million and $52.4 million, respectively, of vessel construction costs were included in Corporate.