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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.

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