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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
Jul. 03, 2012
Feb. 08, 2012
Mar. 31, 2013
Mar. 31, 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     15,644,000   15,644,000 9,144,000 3,487,500 2,700,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period     164,770 224,191        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)     $ 27.84 $ 23.26        
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number     1,185,500          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 8,579          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years 6 months 11 days          
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized     $ 97,222          
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition     9 years 2 months 5 days          
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