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Stock Incentive Plans and Stock Purchase Plan - Schedule of Weighted Average Grant Date Fair Values (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Shares, Non-vested shares at January 1, 2013 1,961,796    
Number of Shares, Awarded 634,882    
Number of Shares, Forfeited (27,666)    
Number of Shares, Vested (1,049,036)    
Number of Shares, Non-vested shares at December 31, 2013 1,519,976 1,961,796  
Weighted Average Fair Value, Non-vested shares at January 1, 2013 $ 30.97    
Weighted Average Fair Value, Awarded $ 46.48 $ 30.06 $ 35.50
Weighted Average Fair Value, Forfeited $ 35.37    
Weighted Average Fair Value, Vested $ 31.77    
Weighted Average Fair Value, Non-vested shares at December 31, 2013 $ 37.78 $ 30.97