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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 6 Months Ended
Jul. 03, 2012
Feb. 08, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period     456,000 489,000 680,000 611,000
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 14.75 $ 13.48 $ 17.55 $ 13.92
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     1,348,000   1,348,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 9,054   $ 9,054  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition         2 years 2 months 12 days  
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 55,362   $ 55,362  
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition         9 years  
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