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Summary of Vessels Impaired and Amount of Impairment Incurred (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Vessel
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Vessel
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
Jun. 30, 2018
USD ($)
Vessel
Jun. 30, 2017
USD ($)
Vessel
Mar. 31, 2017
USD ($)
Vessel
Vehicle
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]                          
Number of vessels impaired in the period | Vessel   2 [1]               5 15 [1]    
Amount of impairment incurred   $ 1,215 [2] $ 16,777             $ 16,777 [3] $ 7,401 [2]    
Combined fair value of assets incurring impairment after having recorded impairment charges                   $ 8,763      
Predecessor                          
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]                          
Number of vessels impaired in the period | Vessel       77 [1]         79     89 [1] 132
Number of ROVs impaired during the period | Vehicle                         8
Amount of impairment incurred $ 21,325     $ 163,423 [2] $ 64,857 $ 253,422 $ 129,562 $ 36,886 $ 184,748 [3]     $ 228,280 [2] $ 484,727 [3]
Combined fair value of assets incurring impairment after having recorded impairment charges                 $ 571,821       $ 933,068
[1] For the quarter and six months periods ended June 30, 2018, there were 2 and 15 stacked vessels impaired, respectively. For the quarter ended June 30, 2017, there were 72 stacked vessels and 5 active vessels impaired, respectively and for the six month period ended June 30, 2017 there were 83 stacked vessels and 6 active vessels impaired, respectively.
[2] Refer to Note (14) for additional information regarding asset impairment.
[3] 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.