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Stock-Based Compensation (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 $ 2,978,000  
Tax Benefit from Stock Options Exercised       2,978,000 $ 4,277,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value     $ 12,433,000 $ 6,351,000 $ 8,016,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period     455,528 537,276 1,061,513
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 27.27 $ 21.19 $ 12.91
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     658,005    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 4,708,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years    
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 71,870,000    
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition     6 years 8 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value     $ 6,980,000 $ 8,317 $ 9,306
Related Party Transaction Restricted Shares Granted During The Period 1,893,342 1,463,057      
Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Price   $ 27.34      
Subsequent Event [Member] | Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Price $ 21.13