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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 ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jul. 31, 2017
USD ($)
Vessel
Dec. 31, 2017
USD ($)
Vessel
Dec. 31, 2018
USD ($)
Vessel
Mar. 31, 2017
USD ($)
Vessel
Vehicle
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]                      
Number of vessels impaired during the period | Vessel                 5 56  
Amount of impairment incurred | $   $ 36,878 $ 16,853 $ 1,215 $ 6,186 $ 16,777     $ 16,777 [1] $ 61,132 [1]  
Predecessor                      
Schedule of Vessels Impaired and Amount of Impairment Incurred [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 $ 184,748 [1]     $ 484,727 [1]
[1] The twelve months ended December 31, 2018, the period August 1, 2017 through December 31, 2017 and the twelve months ended March 31, 2017 included $3.5 million, $2.3 million and $2.2 million respectively, of impairments related to inventory and other non-vessel assets. There were no impairments to non-vessel assets during the period April 1, 2017 through July 31, 2017.