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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 1,357	$ 1,485
Unamortized Stock-Based Compensation	6,925	13,826
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 776	$ 688
Remaining Weighted Average Period (years)	1 year 6 months	2 years 4 months 24 days
Unamortized Stock-Based Compensation	$ 4,555	$ 9,238
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 123	$ 96
Remaining Weighted Average Period (years)	2 months 12 days	2 months 12 days
Unamortized Stock-Based Compensation	$ 82	$ 64
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 458	$ 701
Remaining Weighted Average Period (years)	1 year 8 months 12 days	2 years 4 months 24 days
Unamortized Stock-Based Compensation	$ 2,288	$ 4,524

X

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

+ References

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