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Schedule of Weighted-Average Restricted Stock Unit Award Fair Value (Detail) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award      
Non-vested at January 1 $ 67,970 $ 47,840 $ 35,580
Awarded 108,740 115,510 72,760
Vested 54,270 43,990 31,530
Forfeited 85,710 65,520 45,360
Non-vested at December 31 $ 88,710 $ 67,970 $ 47,840