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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 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     94,674 193,264 393,201 430,774        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 25.55 $ 19.36 $ 26.70 $ 21.16        
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     712,206   712,206          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 6,090   $ 6,090          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years 6 months              
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 76,720   $ 76,720          
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition         7 years 6 months          
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