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Stock-Based Compensation (Detail) - (Table 6) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
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 161,000 410,250
Granted (in Dollars per share) $ 35.12 $ 28.88
Vested (228,000) (316,500)
Vested (in Dollars per share) $ 24.28 $ 24.73
Forfeited (2,000) (24,000)
Forfeitures (in dollars per share) $ 27.03 $ 20.54
Non-vested at March 31 4,188,000 4,403,250
Non-vested at March 31 (in Dollars per share) $ 24.54 $ 24.51