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Summary of Significant Accounting Policies - Difference Between Federal Statutory Rate and Effective Tax Rate (Detail)	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended		12 Months Ended
	Aug. 13, 2018	Sep. 30, 2018	Sep. 30, 2017	Aug. 13, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Line Items]
Tax at statutory rate		21.00%			21.00%
Tax effect of:
State income taxes, net of federal benefit		2.00%
Valuation allowance on deferred tax assets		(0.60%)
Nondeductible stock-based compensation		(0.20%)
Effective tax rate		22.20%
Predecessor
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Line Items]
Tax at statutory rate	21.00%		35.00%	21.00%		35.00%	35.00%
Tax effect of:
State income taxes, net of federal benefit	4.50%		3.80%	3.90%		4.10%
Valuation allowance on deferred tax assets	(21.10%)		(37.80%)	(24.10%)		(39.20%)
Nondeductible stock-based compensation	(0.70%)		(0.70%)	(0.70%)		(1.10%)
Other	(7.40%)			(1.30%)		(0.10%)
Effective tax rate	(3.70%)		0.30%	(1.20%)		(1.30%)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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