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Stock Compensation Plans - Stock Option Transactions Under Various Stock-Based Employee Compensation Plans (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Outstanding, Beginning Balance, Shares 2,124,886    
Granted, Shares 1,807,000    
Exercised, Shares (682,263) (586,563) (113,359)
Canceled, Shares (17,200)    
Outstanding, Ending Balance, Shares 3,232,423 2,124,886  
Exercisable, Ending Balance, Shares 1,737,823    
Outstanding, Beginning Balance, Weighted Average Exercise Price $ 22.36    
Granted, Weighted Average Exercise Price $ 42.31    
Exercised, Weighted-Average Exercise Price $ 24.90    
Canceled, Weighted Average Exercise Price $ 38.73    
Outstanding, Ending Balance, Weighted Average Exercise Price $ 32.89 $ 22.36  
Exercisable, Ending Balance, Weighted Average Exercise Price $ 25.16    
Outstanding, Ending balance, Weighted Average Remaining Contractual Term 7 years 4 months 13 days    
Exercisable, Ending Balance, Weighted Average Remaining Contractual Term 5 years 11 months 12 days