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Debt Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized	$ 7,547		$ 15,146
Interest costs capitalized	194		368
Total interest and debt costs	$ 7,741		$ 15,514
Predecessor
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized		$ 10,605		$ 31,613
Interest costs capitalized		601		1,818
Total interest and debt costs		$ 11,206		$ 33,431

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of interest capitalized during the period.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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-SubTopic 20
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