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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 1,231	$ 2,164	$ 3,776	$ 5,159
Unamortized Stock-Based Compensation	4,817	10,449	4,817	10,449
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	695	1,082	$ 2,173	$ 2,751
Remaining Weighted Average Period (years)			1 year 3 months 18 days	2 years 2 months 12 days
Unamortized Stock-Based Compensation	3,030	6,849	$ 3,030	$ 6,849
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	110	105	$ 351	$ 300
Remaining Weighted Average Period (years)			8 months 12 days	8 months 12 days
Unamortized Stock-Based Compensation	293	280	$ 293	$ 280
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	426	977	$ 1,252	$ 2,108
Remaining Weighted Average Period (years)			1 year 3 months 18 days	2 years
Unamortized Stock-Based Compensation	$ 1,494	$ 3,320	$ 1,494	$ 3,320

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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 noncash expense for share-based payment arrangement.

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