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Stock-Based Compensation (Detail) (USD $)
0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
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   23,466,000   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     72,440 97,500 979,436 1,117,500        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 16.90 $ 19.21 $ 12.58 $ 12.35        
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     1,268,546   1,268,546          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 8,400,000   $ 8,400,000          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition         2 years 7 months 2 days          
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 90,404   $ 90,404          
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition         8 years 10 months 21 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   $ 27.34                
Subsequent Event [Member] | Common Stock [Member]
                   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share Price $ 21.13