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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Mar. 31, 2016
Mar. 31, 2015
May. 25, 2012
May. 22, 2009
May. 27, 2007
May. 26, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         23,466,000 13,716,000 5,231,250 4,050,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period     214,328 298,527        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 31.63 $ 26.73        
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     493,009          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 4,235          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     11 months 10 days          
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized       $ 75,510        
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition       6 years 7 months 5 days        
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 $ 21.13 $ 27.34