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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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       $ 32.08        
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   121,683 77,075 510,162 480,762      
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)   $ 30.42 $ 33.77 $ 27.09 $ 27.68      
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number 870,188 870,188   870,188        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       1 year 7 months 6 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     499,000        
Share Price $ 24.83 $ 24.83   $ 24.83        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 4,483,000 4,483,000 5,464,000 4,483,000 5,464,000 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 675,000 675,000   675,000        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 5,625 $ 5,625   $ 5,625        
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 $ 57,085 $ 57,085   $ 57,085        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 3,347,390 3,347,390   3,347,390