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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
May 24, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Treasury Stock Acquired, Average Cost Per Share       $ 31.76        
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   65,390 100,300 575,552 581,062      
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)   $ 24.86 $ 28.83 $ 26.83 $ 27.88      
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number   803,298   803,298        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       1 year 4 months 24 days        
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition       3 years 7 months 6 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 225,000     499,000        
Share Price $ 24.83              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   4,468,000 5,401,000 4,468,000 5,401,000 4,427,000   5,135,000
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   618,750   618,750        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 4,545   $ 4,545        
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   $ 53,957   $ 53,957        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   3,347,390   3,347,390