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Stock-Based Compensation (Detail) - (Table 6) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Non-vested at January 1 4,257,000   4,333,500
Non-vested at January 1 (in Dollars per share) $ 24.24   $ 23.16
Granted 112,000 375,000  
Granted (in Dollars per share) $ 35.78 $ 28.57  
Vested (116,000) (212,250)  
Vested (in Dollars per share) $ 24.54 $ 23.94  
Forfeited (2,000) (24,000)  
Forfeitures (in dollars per share) $ 27.03 $ 20.54  
Non-vested at March 31 4,251,000 4,472,250 4,333,500
Non-vested at March 31 (in Dollars per share) $ 24.54 $ 24.49 $ 23.16