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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
May 24, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Treasury Stock Acquired, Average Cost Per Share       $ 41.23        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               11,000,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period   63,980 65,390 485,516 575,552      
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)   $ 41.50 $ 24.86 $ 27.73 $ 26.83      
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number   514,800   514,800        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       1 year 2 months 12 days        
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition       3 years 9 months 18 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 225,000     254,000        
Share Price     $ 43.83   $ 43.83      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   3,608,000 4,468,000 3,608,000 4,468,000 3,651,000 4,427,000  
Employee Stock Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 3,453   $ 3,453        
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number   168,750   168,750        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 47,527   $ 47,527        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   2,560,543   2,560,543