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Stock-Based Compensation (Detail) - (Table 6) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
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 4,333,500 1,006,500   843,000
Non-vested at January 1 (in Dollars per share) $ 23.16 $ 16.96   $ 11.47
Granted 434,000 3,670,500 574,500  
Granted (in Dollars per share) $ 29.21 $ 24.23 $ 21.10  
Vested (473,500) (340,500) (358,500)  
Vested (in Dollars per share) $ 19.65 $ 16.33 $ 10.37  
Non-vested at June 30 4,257,000 4,333,500 1,006,500 843,000
Non-vested at June 30 (in Dollars per share) $ 24.24 $ 23.16 $ 16.96 $ 11.47
Forfeited (37,000) (3,000) (52,500)  
Forfeitures (in dollars per share) $ 18.82 $ 25.40 $ 18.96