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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 Vessel
Segment Reporting Information [Line Items] |  |  |  |
Other operating revenues | [1] | $ 3,999 |  |
Number of ROVs disposed | Vessel |  |  |  | 8
Subsea Business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other operating revenues |  |  | $ 300 |
[1] | Included in other operating revenues for the quarter ended March 31, 2017, were $0.3 million 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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