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Stock Options and Other Equity-Based Incentive Instruments - Restricted Stock Unit (RSU) Activity (Detail)
 9 Months Ended
Sep. 30, 2022
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) 103,517
RSUs granted (in shares) 57,932
RSUs added through dividend and performance credits (in shares) 2,078
RSUs released (in shares) (48,234)
RSUs forfeited/expired (in shares) (1,421)
Outstanding at end of period (in shares) 113,872
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) 99,763
RSUs granted (in shares) 11,531
RSUs added through dividend and performance credits (in shares) 4,751
RSUs released (in shares) (26,338)
RSUs forfeited/expired (in shares) (1,572)
Outstanding at end of period (in shares) 88,135