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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 2,164	$ 1,457	$ 5,159	$ 4,235
Unamortized Stock-Based Compensation	10,449	9,020	10,449	9,020
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	1,082	870	$ 2,751	$ 2,427
Remaining Weighted Average Period (years)			2 years	2 years
Unamortized Stock-Based Compensation	6,849	5,949	$ 6,849	$ 5,949
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	105	96	$ 300	$ 289
Remaining Weighted Average Period (years)			8 months 12 days	8 months 12 days
Unamortized Stock-Based Compensation	280	257	$ 280	$ 257
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	977	491	$ 2,108	$ 1,519
Remaining Weighted Average Period (years)			2 years	2 years
Unamortized Stock-Based Compensation	$ 3,320	$ 2,814	$ 3,320	$ 2,814

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

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Amount of noncash expense for share-based payment arrangement.

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