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Summary of Activity for Nonvested Restricted Shares (Detail) - Restricted Stock [Member]
 3 Months Ended
Jun. 30, 2023
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Nonvested Restricted Stock March 31, 2023 | shares 219,084
Number of Shares, Granted | shares 85,415
Number of Shares, Vested | shares (22,257)
Number of Shares, Forfeited | shares (3,000)
Number of Shares, Nonvested Restricted Stock at June 30, 2023 | shares 279,242
Weighted Average Grant Date Fair Value, Nonvested Restricted Stock March 31, 2023 | $ / shares $ 96.54
Weighted Average Grant Date Fair Value, Granted | $ / shares 166.75
Weighted Average Grant Date Fair Value, Vested | $ / shares 160.48
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 139.03
Weighted Average Grant Date Fair Value, Nonvested Restricted Stock at June 30, 2023 | $ / shares $ 116.92