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Stock-Based Compensation (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jul. 20, 2017
Mar. 01, 2017
Jan. 03, 2017
Jul. 03, 2012
Feb. 08, 2012
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation               $ 10,510,000  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense           $ 4,019,000 $ 5,244,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value           $ 9,936,000 $ 16,983,000 $ 12,433,000  
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period           409,522 322,022 455,528  
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)           $ 34.02 $ 32.37 $ 27.27  
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number           1,241,187      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized           $ 8,426,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition           3 years 2 months      
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized           $ 63,140,000      
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition           5 years 5 months      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value           $ 21,549,000 $ 9,758 $ 6,980  
Related Party Transaction Restricted Shares Granted During The Period       1,893,342 1,463,057        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period           750,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 150,000 750,000 100,000     1,062,000 262,000 69,000  
Common Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share Price     $ 35.75 $ 21.13 $ 27.34 $ 37.35     $ 40.15