Stock-Based Compensation - Narrative (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Mar. 26, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	May 14, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding, intrinsic value		$ 0		$ 0
Stock options outstanding, weighted-average remaining contractual life				7 years 3 months
Stock options outstanding, weighted average exercise price (in dollars per share)		$ 111.90		$ 111.90
Total unrecognized compensation expense		$ 0		$ 0
Stock options exercisable (in shares)		6,479		6,479
Number of options granted during period (in shares)				0
Stock-based compensation expense		$ 586,000	$ 421,000	$ 1,269,000	$ 1,494,000
Unrecognized stock based compensation expense, net of estimated forfeitures		3,700,000		$ 3,700,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected period of expenses				3 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period				3 years
Restricted stock outstanding, intrinsic value		$ 4,800,000		$ 4,800,000
Number of restricted stock awards or restricted stock units granted during period (in shares)		0		114,041
Performance and Market Based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Restricted stock outstanding, intrinsic value		$ 4,300,000		$ 4,300,000
Number of restricted stock awards or restricted stock units granted during period (in shares)				60,618
Average market value of common stock on date of grant (in dollars per share)				$ 37.95
Minimum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
Minimum | Nonperformance Based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected period of expenses				1 year
Minimum | Performance and Market Based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected period of expenses				1 year
Maximum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Maximum | Nonperformance Based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected period of expenses				3 years
Maximum | Performance and Market Based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected period of expenses				3 years
2019 Omnibus Stock and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares of common stock (in shares)						150,000
2007 Omnibus Stock and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares granted under the plan (in shares)	0