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Stock-Based Compensation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 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     26,381 94,674 240,709 393,201        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 33.60 $ 25.55 $ 31.85 $ 26.70        
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     475,628   475,628          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 3,688   $ 3,688          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition         2 years 8 days          
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 73,722   $ 73,722          
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition         6 years 4 months 24 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