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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 12 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
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, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                                
Total revenues                         $ 151,369 $ 178,753 $ 486,549 $ 406,520
Operating profit (loss)                         (44,615) 1,277 6,894 6,066
Corporate expenses                         (18,246) (14,989) (57,988) (42,972)
Gain on asset dispositions, net                         3,561 6,616 2,263 10,624
Impairment of due from affiliate             $ (20,083)                 (20,083)
Asset impairments and other $ (21,325)   $ (32,549) $ (5,224)     (36,878) $ (16,853) $ (1,215) $ (6,186) $ (16,777) $ (163,423) (184,748) (16,777) (37,773) (61,132)
Operating loss (38,674) $ (5,782) (50,039) $ (22,551) $ (4,394) $ (9,620) (70,077) $ (25,086) $ (140) $ (12,194) (18,091) $ (205,374) (244,048) (23,873) (86,604) (107,497)
Depreciation and amortization                         47,447 20,337 101,931 58,293
Additions to properties and equipment                         2,265 9,834 17,998 21,391
Total assets 3,884,669   1,579,528       1,827,739       1,759,595   3,884,669 1,759,595 1,579,528 1,827,739
Investments in, at equity, and advances to unconsolidated companies 49,367           1,039       29,216   49,367 29,216   1,039
All Other Segments                                
Segment Reporting Information [Line Items]                                
Operating profit (loss)                         876 1,614 6,734 3,742
Depreciation and amortization                         1,139 827   21
Total assets 20,392           7,440       2,443   20,392 2,443   7,440
Operating Segments                                
Segment Reporting Information [Line Items]                                
Operating profit (loss)                         (45,491) (337) 160 2,324
Operating Segments | Americas                                
Segment Reporting Information [Line Items]                                
Operating profit (loss)                         (22,549) (1,599) (805) 8,860
Depreciation and amortization                         13,945 5,767 27,493 16,047
Additions to properties and equipment                         27 144 969 3,771
Total assets 714,891   375,297       380,168       164,958   714,891 164,958 375,297 380,168
Operating Segments | Middle East/Asia Pacific                                
Segment Reporting Information [Line Items]                                
Operating profit (loss)                         (1,434) 451 (6,044) (4,417)
Depreciation and amortization                         9,967 4,716 21,440 11,871
Additions to properties and equipment                         1,042 2,596 5,237 2,982
Total assets 424,896   270,413       233,611       48,268   424,896 48,268 270,413 233,611
Operating Segments | Europe/Mediterranean                                
Segment Reporting Information [Line Items]                                
Operating profit (loss)                         (12,680) (1,497) (1,289) (9,359)
Depreciation and amortization                         9,060 2,794 30,053 11,385
Additions to properties and equipment                             4,001 185
Total assets 597,819   358,943       316,524       171,156   597,819 171,156 358,943 316,524
Operating Segments | West Africa Segment                                
Segment Reporting Information [Line Items]                                
Operating profit (loss)                         (8,828) 2,308 8,298 7,240
Depreciation and amortization                         12,632 6,067 21,166 16,612
Additions to properties and equipment                         375 195 2,721 10,135
Total assets 1,277,552   376,087       483,234       864,300   1,277,552 864,300 376,087 483,234
Corporate                                
Segment Reporting Information [Line Items]                                
Depreciation and amortization                         704 166 1,779 2,357
Additions to properties and equipment                         821 6,899 5,070 4,318
Total assets $ 799,752   $ 198,788       $ 405,723       $ 479,254   799,752 479,254 198,788 405,723
Service | Operating Segments                                
Segment Reporting Information [Line Items]                                
Total revenues                         146,597 171,884 477,015 397,206
Service | Operating Segments | Americas                                
Segment Reporting Information [Line Items]                                
Total revenues                         40,848 45,784 136,958 118,534
Service | Operating Segments | Middle East/Asia Pacific                                
Segment Reporting Information [Line Items]                                
Total revenues                         36,313 39,845 90,321 80,195
Service | Operating Segments | Europe/Mediterranean                                
Segment Reporting Information [Line Items]                                
Total revenues                         15,466 19,895 123,711 56,263
Service | Operating Segments | West Africa Segment                                
Segment Reporting Information [Line Items]                                
Total revenues                         53,970 66,360 126,025 142,214
Other Operating Revenues                                
Segment Reporting Information [Line Items]                                
Total revenues                         $ 4,772 $ 6,869 $ 9,534 $ 9,314