Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 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)	65,167
RSUs added through dividend and performance credits (in shares)	1,968
RSUs released (in shares)	0
RSUs forfeited (in shares)	(1,063)
Outstanding at end of period (in shares)	210,559
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)	0
RSUs released (in shares)	0
RSUs forfeited (in shares)	(1,204)
Outstanding at end of period (in shares)	178,414