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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, 2024
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) 144,487
RSUs granted (in shares) 86,036
RSUs added through dividend and performance credits (in shares) 4,685
RSUs released (in shares) (69,043)
RSUs forfeited (in shares) (4,001)
Outstanding at end of period (in shares) 162,164
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) 123,102
RSUs granted (in shares) 56,516
RSUs added through dividend and performance credits (in shares) 1,536
RSUs released (in shares) (32,248)
RSUs forfeited (in shares) (2,458)
Outstanding at end of period (in shares) 146,448