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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.