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Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs)
 3 Months Ended
Mar. 31, 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) 58,465
RSUs added through dividend and performance credits (in shares) 1,028
RSUs released (in shares) (21,839)
RSUs forfeited (in shares) 0
Outstanding at end of period (in shares) 190,226
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) 51,177
RSUs added through dividend and performance credits (in shares) 0
RSUs released (in shares) 0
RSUs forfeited (in shares) 0
Outstanding at end of period (in shares) 195,892