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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 Vessel
Segment Reporting Information [Line Items] |  |  |  |  |  |
Other operating revenues |  | $ 105,601 |  | $ 197,094 |  |
Number of ROVs disposed | Vessel |  |  |  |  |  | 8
Other Operating Revenues |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Other operating revenues | [1] | $ 1,427 |  | $ 5,426 |  |
Other Operating Revenues | Subsea Business |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Other operating revenues |  |  | $ 500 |  | $ 800 |
[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.

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