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Stock-Based Compensation (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Jun. 18, 2018
Dec. 31, 2017
Jul. 20, 2017
Mar. 01, 2017
Jul. 03, 2012
Feb. 08, 2012
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 03, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Proceeds from Stock Options Exercised               $ 13,036,000 $ 16,433,000 $ 10,713,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value               $ 6,841,000 $ 9,936,000 $ 16,983,000  
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period               773,351,000 614,283,000 483,033,000  
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)               $ 26.38 $ 22.68 $ 21.58  
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number 1,651,337,000             1,651,337,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 7,863,000             $ 7,863,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition               2 years 7 months 21 days      
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized $ 60,517,000             $ 60,517,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value               $ 36,122,000 $ 21,549 $ 9,758  
Related Party Transaction Restricted Shares Granted During The Period           2,840,013 2,194,586        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     7 years         6 years      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period         1,125,000     4,946,738      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   225,000   225,000       585,000 1,593,000 393,000  
Common Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share Price   $ 35.95   $ 26.77 $ 24.90 $ 14.09 $ 18.23       $ 23.83
Executive D [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 6 years   7 years   5 years            
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, Period for Recognition               4 years 6 months