Gain (loss) 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 ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 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	$ 3,561	$ 6,616		$ 2,263	$ 10,624
Amortized gains on sale/leaseback transactions	$ 3,000
Unamortized deferred gains credited to reorganization items on account of lease rejections			$ 105,900
ROVs
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain on dispositions of assets		$ 7,100