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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		12 Months Ended
	Jul. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jul. 31, 2017 USD ($) Vessel		Dec. 31, 2017 USD ($) Vessel		Mar. 31, 2017 USD ($) Vessel Vehicle
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period | Vessel										5
Amount of impairment incurred		$ 16,777								$ 16,777	[1]
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								79				132
Number of ROVs impaired during the period | Vehicle												8
Amount of impairment incurred	$ 21,325		$ 163,423	$ 64,857	$ 253,422	$ 129,562	$ 36,886	$ 184,748	[1]			$ 484,727	[1]
Combined fair value of assets incurring impairment after having recorded impairment charges								$ 571,821				$ 933,068
[1] 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.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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