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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 1,806	$ 1,188	$ 3,598	$ 2,545
Unamortized Stock-Based Compensation	14,287	6,137	14,287	6,137
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	1,167	702	$ 2,223	$ 1,478
Remaining Weighted Average Period (years)			2 years 2 months 12 days	1 year 6 months
Unamortized Stock-Based Compensation	9,734	3,861	$ 9,734	$ 3,861
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	107	118	$ 217	$ 241
Remaining Weighted Average Period (years)			10 months 24 days	10 months 24 days
Unamortized Stock-Based Compensation	367	403	$ 367	$ 403
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	532	368	$ 1,158	$ 826
Remaining Weighted Average Period (years)			2 years 1 month 6 days	1 year 6 months
Unamortized Stock-Based Compensation	$ 4,186	$ 1,873	$ 4,186	$ 1,873

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

+ References

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of noncash expense for share-based payment arrangement.

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