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Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail)
 6 Months Ended
Jun. 30, 2023
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
RSUs released (in shares) 0
Restricted Stock Units (RSUs) | 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) 139,194
RSUs granted (in shares) 83,200
RSUs added through dividend and performance credits (in shares) 2,263
RSUs released (in shares) (67,786)
RSUs forfeited/expired (in shares) (450)
Outstanding at end of period (in shares) 156,421
Restricted Stock Units (RSUs) | 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) 114,481
RSUs granted (in shares) 65,911
RSUs added through dividend and performance credits (in shares) 0
RSUs released (in shares) (55,928)
RSUs forfeited/expired (in shares) (440)
Outstanding at end of period (in shares) 124,024