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Segment Reporting - Information about Revenue by Service Lines and Contract Types (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Revenue Reconciling Item [Line Items]    
Revenues $ 607,818 $ 519,431
Offshore [Member]    
Segment Reporting Revenue Reconciling Item [Line Items]    
Revenues 394,724 354,064
Subsea and Other [Member]    
Segment Reporting Revenue Reconciling Item [Line Items]    
Revenues 213,094 165,367
Fixed-Price [Member]    
Segment Reporting Revenue Reconciling Item [Line Items]    
Revenues 582,592 475,921
Unit-Basis and Other [Member]    
Segment Reporting Revenue Reconciling Item [Line Items]    
Revenues $ 25,226 $ 43,510