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Stock-based Compensation - Additional Information (Detail) - USD ($) $ in Thousands		5 Months Ended	7 Months Ended	12 Months Ended
	Aug. 14, 2018	Dec. 31, 2018	Aug. 13, 2018	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 994	$ 3,912	$ 6,464	$ 4,020
Performance multiplier, minimum				0.00%
Performance multiplier, maximum				200.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of unvested common stock outstanding (in shares)				1,038,006	1,092,309
Fair value of vested restricted stock		3,541	$ 2,676	$ 2,852	$ 925
Performance Share Units (PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortized vesting period of restricted stock				3 years
Minimum final number of shares of common stock issuable based on performance multiplier (in shares)				0
Maximum final number of shares of common stock issuable based on performance multiplier (in shares)				2,272,976
Number of units, earned			85,987
Shares of unvested common stock outstanding (in shares)	1,028,672
Fair value of vested restricted stock	$ 8,800
Minimum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortized vesting period of restricted stock				1 year
Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortized vesting period of restricted stock				3 years
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 1,000	$ 3,900	$ 6,500	$ 4,000
2019 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term Incentive Plan shares available for future awards of performance share units, restricted stock grants or other equity awards (in shares)				4,776,556

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