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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.

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