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Stock-Based Compensation (Detail) - (Table 4) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at January 1, 2012 3,403,500 4,054,500 4,054,500
Outstanding at January 1, 2012 (in Dollars per share) $ 13.71 $ 11.86 $ 9.39
Granted 584,000 354,000 927,000
Granted (in Dollars per share) $ 30.03 $ 27.09 $ 19.95
Exercised (563,000) (874,500) (658,500)
Exercised (in Dollars per share) $ 10.28 $ 10.61 $ 7.59
Cancelled/Forfeited (51,500) (130,500) (268,500)
Outstanding at June 30, 2012 3,373,000 3,403,500 4,054,500
Outstanding at June 30, 2012 (in Dollars per share) $ 17.01 $ 13.71 $ 11.86
Outstanding at June 30, 2012 3 years 7 months     
Outstanding at June 30, 2012 (in Dollars) $ 94,064     
Exercisable at June 30, 2012 2,163,000    
Exercisable at June 30, 2012 (in Dollars per share) $ 12.88    
Stock based compensation, shares exercisable, weighted average remaining contractual term 2 years 10 months    
Exercisable at June 30, 2012 (in Dollars) $ 51,269    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 22.32 $ 13.40 $ 12.95