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Unamortized Stock-Based Compensation Expenses (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 7,160,000	$ 5,805,000	$ 4,714,000
Unamortized Stock-Based Compensation	8,552,000	7,731,000	5,430,000
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	0	0	345,000
Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation			416,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 3,655,000	$ 3,272,000	$ 2,355,000
Remaining Weighted Average Period (years)	1 year 10 months 24 days	1 year 3 months 18 days	1 year
Unamortized Stock-Based Compensation	$ 5,512,000	$ 5,006,000	$ 3,628,000
Unrestricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 411,000	$ 385,000	$ 350,000
Remaining Weighted Average Period (years)	4 months 24 days	4 months 24 days	4 months 24 days
Unamortized Stock-Based Compensation	$ 205,000	$ 160,000	$ 160,000
Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation	$ 3,094,000	$ 2,148,000	$ 1,248,000
Remaining Weighted Average Period (years)	1 year 10 months 24 days	1 year 9 months 18 days	1 year 8 months 12 days
Unamortized Stock-Based Compensation	$ 2,835,000	$ 2,565,000	$ 1,642,000

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