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Summary of Performance option activity (Detail) - Performance Based Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	114,658	120,782	140,411
Incentive Stock Option Plans, Option exercised		(6,124)	(19,629)
Incentive Stock Option Plans, Ending balance	114,658	114,658	120,782
Weighted Average Price Per Share, Beginning balance	$ 11.49	$ 11.49	$ 11.49
Weighted Average Price Per Share, Option exercised		11.49	11.49
Weighted Average Price Per Share, Ending balance	$ 11.49	$ 11.49	$ 11.49

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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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