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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.