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Asset Impairments - Additional Information (Detail) - Predecessor $ in Thousands		1 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
		Jul. 31, 2017 USD ($) Vessel	Sep. 30, 2016 USD ($) Vessel	Jul. 31, 2017 USD ($) Vessel	Sep. 30, 2016 USD ($) Vessel
Derivatives, Fair Value [Line Items]
Asset impairments	[1]	$ 21,325	$ 129,562	$ 184,748	$ 166,448
Number of vessels impaired during the period | Vessel		8	42	79	54
Fair value of assets incurring impairment		$ 29,339	$ 322,550	$ 571,821	$ 477,950
Stacked Vessels
Derivatives, Fair Value [Line Items]
Asset impairments				$ 157,800
Number of vessels impaired during the period | Vessel				73
Fair value of assets incurring impairment				$ 505,600
Active Vessels
Derivatives, Fair Value [Line Items]
Asset impairments				$ 26,900
Number of vessels impaired during the period | Vessel				6
Fair value of assets incurring impairment				$ 66,200
[1] Refer to Note (16) for additional information regarding asset impairment charges.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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