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Summary of Performance option activity (Detail) - Performance Based Stock Options - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incentive Stock Option Plans, Beginning balance   114,658
Incentive Stock Option Plans, Options exercised   (32,850)
Incentive Stock Option Plans, Ending balance 81,808 81,808
Weighted Average Price Per Share, Beginning balance   $ 11.49
Weighted Average Price Per Share, Option exercised   11.49
Weighted Average Price Per Share, Ending balance $ 11.49 $ 11.49