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Stock-Based Compensation Plans - Restricted Stock Granted (Detail) - Time Based Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock grants 402,215 384,394 429,344
Restricted stock grants, Weighted average grant date fair value $ 45.5 $ 37.53 $ 41.46
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock vesting period 1 year 1 year 1 year
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock vesting period 5 years 5 years 5 years
Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock grants 367,127 344,122 383,288
Outside Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock grants 35,088 40,272 46,056