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Gain on Disposition of Assets, Net - Additional Information (Detail) $ in Thousands	3 Months Ended		4 Months Ended	5 Months Ended	6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jul. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Vessel	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Vessel	Mar. 31, 2017 USD ($)
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Number of ROVs disposed | Vessel				8				8
Gain on dispositions of assets	$ 1,338			$ 6,616	$ 3,257
Net properties and equipment	$ 803,725			837,520	$ 803,725		$ 837,520	$ 837,520
Unamortized deferred gains credited to reorganization items on account of lease rejections							$ 105,900
Date of petition for bankruptcy							May 17, 2017
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			$ 15,700	$ 15,700
Other Operating Revenues | Subsea Business
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Revenues				$ 2,500
Predecessor
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain on dispositions of assets		$ 3,189	$ 3,561			$ 9,253			$ 24,099
Net properties and equipment									2,864,762
Amortized gains on sale/leaseback transactions			3,000						23,400
Predecessor | Other Operating Revenues | Subsea Business
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Revenues			$ 800						$ 3,200

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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