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Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs)
 9 Months Ended
Sep. 30, 2025
shares
Service Condition Vesting RSUs  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding at beginning of period (in shares) 152,572
RSUs granted (in shares) 81,060
RSUs added through dividend and performance credits (in shares) 3,585
RSUs released (in shares) (75,845)
RSUs forfeited (in shares) (7,593)
Outstanding at end of period (in shares) 153,779
Market Plus Service Condition Vesting RSUs  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding at beginning of period (in shares) 144,715
RSUs granted (in shares) 49,692
RSUs added through dividend and performance credits (in shares) 0
RSUs released (in shares) (7,911)
RSUs forfeited (in shares) (8,628)
Outstanding at end of period (in shares) 177,868