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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
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     23,074 32,072 416,275 462,846        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 31.02 $ 25.69 $ 26.94 $ 21.48        
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     704,000   704,000          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 5,375   $ 5,375          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years 2 months 13 days              
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 73,415   $ 73,415          
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