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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 18, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 25, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           35,199,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period   132,304 84,533 698,732 523,545  
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)   $ 30.25 $ 23.15 $ 25.68 $ 22.23  
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number   1,718,970   1,718,970    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 8,883   $ 8,883    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2 years 9 months 22 days        
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized   $ 59,527   $ 59,527    
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition   4 years 9 months 18 days        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   1,068,750        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 225,000     576,000    
Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Price $ 35.95