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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) $ in Thousands | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Vessel | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Vessel | Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses | $ 24,425 |  |  |  |  |  | $ 46,619 |  | $ 47,990 |  |  |  |  |  |
Other operating revenues | 105,601 |  |  |  |  |  | $ 178,753 |  | 197,094 |  |  |  |  |  |
Number of ROVs disposed | Vessel |  |  |  |  |  |  | 8 |  |  |  |  |  | 8 |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  | $ 33,059 |  | $ 41,832 |  |  |  |  |  | $ 74,786 |  |  | $ 145,879 |
Other operating revenues |  |  | 115,106 |  | 151,369 |  |  |  |  |  | 275,855 |  |  | 601,611 |
Other Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating revenues | 1,427 | [1] |  |  |  |  | $ 6,869 |  | 5,426 | [1] |  |  |  |  |
Other Operating Revenues | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating revenues |  |  | 2,849 | [1] | 4,772 |  |  |  |  |  | 6,693 | [1] |  | 17,795 |
Other Operating Revenues | Subsea Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating revenues |  |  | 500 |  |  |  |  |  |  |  | 800 |  |  |  |
Corporate Vessels | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction costs |  |  |  |  |  |  | 9,300 |  | 11,200 |  |  |  | $ 9,300 |  |
Corporate Vessels | Construction | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction costs |  |  |  |  | 47,500 |  |  |  |  |  |  |  |  | 52,400 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses | $ 7,810 |  |  |  |  |  | $ 14,823 | [2] | $ 14,494 |  |  |  |  |  |
Corporate | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  | $ 14,702 |  | 17,542 | [2] |  |  |  |  | $ 36,459 |  |  | 55,389 | [2]
Troms Offshore Supply AS | Corporate | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  | $ 6,700 |  |  |  |  |  |  |  |  | $ 29,000 |
[1] | 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.
[2] | Restructuring-related professional services costs for the five month period from August 1, 2017 through December 31, 2017 are included in reorganization items. Included in corporate general and administrative expenses for the period four month period April 1, 2017 through July 31, 2017 (Predecessor) and year ended March 31, 2017 (Predecessor) were $6.7 million and $29 million of restructuring-related professional service costs, respectively.

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