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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 1,792	$ 1,357
Unamortized Stock-Based Compensation	8,474	6,925
Time-Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 1,057	$ 776
Remaining Weighted Average Period (years)	1 year 9 months 18 days	1 year 6 months
Unamortized Stock-Based Compensation	$ 5,703	$ 4,555
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 110	$ 123
Remaining Weighted Average Period (years)	2 months 12 days	2 months 12 days
Unamortized Stock-Based Compensation	$ 73	$ 82
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 625	$ 458
Remaining Weighted Average Period (years)	1 year 9 months 18 days	1 year 8 months 12 days
Unamortized Stock-Based Compensation	$ 2,698	$ 2,288

X

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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