Gain on Disposition of Assets, Net - Additional Information (Detail) $ in Thousands	4 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Vehicle	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Number of ROVs disposed | Vehicle		8
Gain on dispositions of assets		$ 6,616		$ 10,624
Net properties and equipment		850,935	$ 850,935	$ 1,089,857
Unamortized deferred gains credited to reorganization items on account of lease rejections			$ 105,900
Date of petition for bankruptcy			May 17, 2017
Subsea Business
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Other operating revenues		2,500
Predecessor
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain on dispositions of assets	$ 3,561				$ 24,099
Amortized gains on sale/leaseback transactions	3,000				23,400
Predecessor | Subsea Business
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Other operating revenues	800				$ 3,200
ROVs
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain on dispositions of assets		$ 7,100
Net properties and equipment	$ 15,700