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Accounting for Stock Based Compensation - Summarizes RSU Activity (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Outstanding at beginning of period, Shares 17,923 13,600 11,376
Granted, Shares 21,296 17,923 13,600
Vested, Shares (17,923) (11,900) (11,376)
Forfeited, Shares   (1,700)  
Outstanding at end of period, Shares 21,296 17,923 13,600
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value $ 56.96 $ 73.54 $ 70.33
Granted, Weighted-Average Grant Date Fair Value 50.72 56.96 73.54
Vested, Weighted-Average Grant Date Fair Value 56.96 73.54 70.33
Forfeited, Weighted-Average Grant Date Fair Value   73.54  
Outstanding at end of period, Weighted-Average Grant Date Fair Value $ 50.72 $ 56.96 $ 73.54
RSU | Time Vesting Shares [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Outstanding at beginning of period, Shares 231,861 201,578 193,626
Granted, Shares 184,959 136,964 117,507
Vested, Shares (129,477) (82,695) (95,692)
Forfeited, Shares (84,682) (23,986) (13,863)
Outstanding at end of period, Shares 202,661 231,861 201,578
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value $ 63.19 $ 64.27 $ 56.02
Granted, Weighted-Average Grant Date Fair Value 54.2 58.68 66.86
Vested, Weighted-Average Grant Date Fair Value 64.55 59.43 49.85
Forfeited, Weighted-Average Grant Date Fair Value 57.71 59.47 70.52
Outstanding at end of period, Weighted-Average Grant Date Fair Value $ 56.35 $ 63.19 $ 64.27