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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
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       $ 41.18      
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   421,536 121,683        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)   $ 25.64 $ 30.42        
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number   352,780   352,780      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       1 year 8 months 12 days      
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition       4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 225,000     28,000      
Share Price $ 24.83   $ 24.83        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 4,483,000 3,630,000 4,483,000 3,630,000 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   $ 2,248   $ 2,248      
Restricted Stock [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   $ 51,970   $ 51,970      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   2,560,543   2,560,543