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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 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 $ 6,100 $ 6,100  
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   $ 117.11  
Granted awards (shares)   683  
Unrecognized compensation expense related to the awards to non-employee directors 700 $ 700  
Total [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted awards (shares)   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)   66,612  
Vesting period   3 years  
Payment, Tax Withholding, Share-based Payment Arrangement   $ 1,500  
Intrinsic value of the SICP awards $ 23,400 $ 23,400  
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    
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