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Summary of Option Activity (Detail) - Incentive Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	332,823	384,064	472,783
Incentive Stock Option Plans, Option exercised	(196,736)	(51,241)	(88,719)
Incentive Stock Option Plans, Ending balance	123,087	332,823	384,064
Incentive Stock Option Plans, Option forfeited	(13,000)
Weighted Average Price Per Share, Beginning balance	$ 9.14	$ 9.10	$ 9.38
Weighted Average Price Per Share, Option exercised	7.79	8.87	10.62
Weighted Average Price Per Share, Ending balance	11.48	$ 9.14	$ 9.10
Weighted Average Price Per Share, Option forfeited	$ 7.50

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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