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Debt Costs (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized		$ 5,240	$ 7,585		$ 22,731
Interest costs capitalized			153		521
Total interest and debt costs		$ 5,240	$ 7,738		$ 23,252
Predecessor
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized	$ 574			$ 32,188
Interest costs capitalized				1,817
Total interest and debt costs	$ 574			$ 34,005

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
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-SubTopic 20
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