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Summary of Vessels and ROVs Impaired, Amount of Impairment Incurred and Combined Fair Value of Assets after Impairment Charges (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jul. 31, 2017
USD ($)
Vessel
Dec. 31, 2017
USD ($)
Vessel
Mar. 31, 2017
USD ($)
Vessel
Vehicle
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]                    
Number of vessels impaired during the period | Vessel                 5  
Amount of impairment incurred   $ 16,777             $ 16,777 [1]  
Combined fair value of assets incurring impairment after having recorded impairment charges                 $ 8,763  
Predecessor                    
Schedule of Combined Fair Value of Assets that Incurred Impairments [Line Items]                    
Number of vessels impaired during the period | Vessel               79   132
Number of ROVs impaired during the period | Vehicle                   8
Amount of impairment incurred $ 21,325   $ 163,423 $ 64,857 $ 253,422 $ 129,562 $ 36,886 $ 184,748 [1]   $ 484,727 [1]
Combined fair value of assets incurring impairment after having recorded impairment charges               $ 571,821   $ 933,068
[1] The period August 1, 2017 through December 31, 2017 and the year ended March 31, 2017 included $2.3 million and $2.2 million, respectively, of impairments related to inventory and other non-vessel assets.