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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2020
Mar. 31, 2021
Mar. 31, 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   $ 35.87        
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   356,603 388,479      
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)   $ 25.55 $ 26.04      
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number   400,713        
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   4 years 2 months 12 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 225,000 11,000        
Share Price       $ 24.83    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   3,593,000 4,565,000 3,651,000 4,427,000  
Share based payment vested Awards   2,092,188        
Share based payment unvested Awards   3,008,209        
Employee Stock Option [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   281,250        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 2,635        
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   $ 52,106        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   2,560,543