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Summary of Significant Accounting Policies - Consolidated Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Aug. 13, 2018	Sep. 30, 2018	Sep. 30, 2017	Aug. 13, 2018	Sep. 30, 2017
Income Tax Expense Benefit From Continuing Operations [Line Items]
Current - State		$ 57
Deferred - State		20
Deferred - Federal		3,863
Total		$ 3,940
Predecessor
Income Tax Expense Benefit From Continuing Operations [Line Items]
Current - State	$ (22)		$ 18	$ 13	$ 115
Deferred - State	(309)		(87)	(1,360)	768
Deferred - Federal	936			2,412
Total	$ 605		$ (69)	$ 1,065	$ 883

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