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Summary of Performance option activity (Detail) - Performance Based Stock Options - $ / shares	3 Months Ended					9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	81,808	81,808	81,808	81,808	114,658	81,808	114,658
Incentive Stock Option Plans, Options exercised	0			(32,850)		0	(32,850)
Incentive Stock Option Plans, Ending balance	81,808	81,808	81,808	81,808	81,808	81,808	81,808
Weighted Average Exercise Price Per Share, Beginning balance	$ 11.49	$ 11.49	$ 11.49	$ 11.49	$ 11.49	$ 11.49	$ 11.49
Weighted Average Exercise Price Per Share, Option exercised	0			11.49		0	11.49
Weighted Average Exercise Price Per Share, Ending balance	$ 11.49	$ 11.49	$ 11.49	$ 11.49	$ 11.49	$ 11.49	$ 11.49

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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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