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Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs)
 12 Months Ended
Dec. 31, 2023
$ / shares
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, beginning balance (in shares) 139,194
RSUs granted (in shares) 84,066
Additional market plus service condition RSUs vested (in shares) 0
RSUs added through dividend credits (in shares) 4,706
RSUs released through vesting (in shares) (81,902)
RSUs forfeited/expired (in shares) (1,577)
Outstanding, ending balance (in shares) 144,487
RSUs granted, weighted average fair value on date of grant (in USD per share) | $ / shares $ 34.52
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, beginning balance (in shares) 114,481
RSUs granted (in shares) 55,908
Additional market plus service condition RSUs vested (in shares) 10,301
RSUs added through dividend credits (in shares) 0
RSUs released through vesting (in shares) (55,928)
RSUs forfeited/expired (in shares) (1,660)
Outstanding, ending balance (in shares) 123,102
RSUs granted, weighted average fair value on date of grant (in USD per share) | $ / shares $ 27.72