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Stock-Based Awards - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Dec. 31, 2002	Jun. 20, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Award
Stock option issuance period			10 years
Option vested period			1 year
Shares of common stock authorized to issue under equity award plan		10,000,000
Stock-based compensation expense			$ 11,706	$ 11,590	$ 13,255
Tax benefit realized for the tax deductions for share-based compensation			833	1,649	2,364
Total intrinsic value of options exercised			168	301	4,218
Cash received from option exercise			$ 292	$ 160	$ 191
Outstanding options	305,000		305,000	485,536	570,537	1,158,828
Options remaining average contractual term	3 months 18 days		3 months 18 days
Options intrinsic value	$ 57
Aggregate fair value of awards that vested			$ 4,783	$ 6,720	$ 5,975
Below 25th Percentile [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage			0.00%
At 25th Percentile [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage			50.00%
At 50th Percentile [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage			100.00%
At 100th Percentile [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage			200.00%
Income Tax Expense Benefit [Member]
Share-based Payment Award
Tax benefit realized for the tax deductions for share-based compensation			$ 2,739	$ 2,791	$ 3,015
Performance Based Restricted Stock Unit [Member] | Maximum [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage			200.00%
Performance Based Restricted Stock Unit [Member] | Minimum [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage			0.00%

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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