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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Summary of Equity-Based Compensation Plans with Grants Outstanding (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares authorized 60,000,000 60,000,000
2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Authorized 700,000  
Options/RSUs Outstanding 88,000  
Shares Available to Issue 0  
Granted (Shares) 8,000  
2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Authorized 950,000  
Options/RSUs Outstanding 404,000  
Shares Available to Issue 126,000  
Granted (Shares) 34,000  
2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Authorized 275,000  
Options/RSUs Outstanding 120,000  
Shares Available to Issue 155,000  
Granted (Shares) 1,000  
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options issued under the plan (in Shares) 4,000  
RSUs | 2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares authorized 40,000  
Shares Available to Issue 36,000  
Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options issued under the plan (in Shares) 43,000  
Granted (Shares) 43,000  
Options | 2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 4,000  
Options | 2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 17,000  
Options | 2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 1,000  
Employee Performance Based Stock Option [Member] | 2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 4,000  
Employee Performance Based Stock Option [Member] | 2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 17,000  
Employee Performance Based Stock Option [Member] | 2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (Shares) 0  
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Performance Based Restricted Stock Unit [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted share units vesting period or option vesting period 3 years  
Percentage of options vesting rights 33.00%  
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of options vesting rights 25.00%  
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | Employee Performance Based Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted share units vesting period or option vesting period 4 years  
Percentage of options vesting rights 25.00%  
Share-based Compensation Award, Tranche Three [Member] | Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of options vesting rights 50.00%  
Share-based Compensation Award, Tranche Three [Member] | Employee Performance Based Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of options vesting rights 50.00%