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Stock-Based Compensation (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 15 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period     65,000 745,000 697,000 86,000
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 28.82 $ 18.53 $ 15.23 $ 24.61
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     1,269,000 1,269,000   1,269,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 7,845 $ 7,845   $ 7,845
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       2 years 1 month    
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 92,431 $ 92,431   $ 92,431
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition       10 years 1 month    
Related Party Transaction Restricted Shares Granted During The Period 1,262,228 975,371        
Common Stock [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Price   41.01        
Subsequent Event [Member] | Common Stock [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Price 31.69