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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2021
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation     14,020 10,319
Payment, Tax Withholding, Share-based Payment Arrangement     $ 1,478 $ 977
Unrecognized compensation cost   $ 5,600 $ 5,600  
Awards to non-employee directors [Member]        
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 $ 129.09   $ 117.11  
Granted awards (shares) 342   683  
Unrecognized compensation expense related to the awards to non-employee directors   500 $ 500  
Shares awarded to non-employee directors [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 $ 129.09   $ 117.11  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 342   683  
Total [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted awards (shares)     6,830  
Shares awarded to non-employee directors [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     6,830  
Award to key employees [Member]        
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 Expired In Period     (852)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 102.73  
Granted awards (shares)     68,562  
Vesting period     3 years  
Payment, Tax Withholding, Share-based Payment Arrangement     $ 1,500  
Intrinsic value of the SICP awards   $ 23,500 $ 23,500  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (5,384)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   $ 93.39    
Shares awarded to non-employee directors [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     $ 102.73  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     68,562  
Accelerated Vested Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation     14,020