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Income Taxes - Income Tax Expense Benefit Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2018	Aug. 13, 2018	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ 17,444	$ (19,255)	$ (12,941)	$ 26,185
Tax effect of:
Alternative minimum tax	(1,349)	0	0	0
Valuation allowance on deferred tax assets	(903)	22,053	(919)	(494)
State income taxes, net of federal benefit	3,863	(3,599)	3,746	(499)
Nondeductible transaction costs	0	0	0	1,417
Nondeductible stock-based compensation	(120)	668	1,109	886
Other	9	1,198	(205)	308
Total	$ 18,944	$ 1,065	$ (9,210)	$ 27,803

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