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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 1,711	$ 1,231	$ 5,309	$ 3,776
Unamortized Stock-Based Compensation	12,066	4,817	12,066	4,817
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	1,246	695	$ 3,469	$ 2,173
Remaining Weighted Average Period (years)			2 years	1 year 3 months 18 days
Unamortized Stock-Based Compensation	8,277	3,030	$ 8,277	$ 3,030
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	100	110	$ 317	$ 351
Remaining Weighted Average Period (years)			8 months 12 days	8 months 12 days
Unamortized Stock-Based Compensation	267	293	$ 267	$ 293
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	365	426	$ 1,523	$ 1,252
Remaining Weighted Average Period (years)			2 years	1 year 3 months 18 days
Unamortized Stock-Based Compensation	$ 3,522	$ 1,494	$ 3,522	$ 1,494

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

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