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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Aug. 08, 2016
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     21,006 23,074 261,715 416,275          
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 32.72 $ 31.02 $ 31.92 $ 26.94          
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     645,372   645,372            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 4,024   $ 4,024            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition         1 year 7 months 5 days            
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 70,980   $ 70,980            
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition         6 years 1 month 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         $ 34.42