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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Summary of Equity-Based Compensation Plans with Grants Outstanding (Textual) (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
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 2,584.37  
Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding 593,000 749,000
Options | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of options vesting rights 25.00%  
2010 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized 700,000  
Options outstanding 74,000  
Restricted share units outstanding 14,000  
Shares Available to Issue 0  
2010 Plan | RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted share units outstanding 18,000 15,000
2014 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized 950,000  
Shares Available to Issue 126,000  
2018 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized 275,000  
Options outstanding 116,000  
Restricted share units outstanding 4,000  
Shares Available to Issue 155,000  
2018 Plan | RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Available to Issue 36,000  
Common stock, shares authorized 40,000