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Stock-Based Compensation (Detail) - (Table 5) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at January 1, 2012   3,373,000
Outstanding at January 1, 2012 (in Dollars per share)   $ 17.01
Granted   401,000
Granted (in Dollars per share)   $ 35.15
Exercised   (63,000)
Exercised (in Dollars per share)   $ 16.46
Cancelled/Forfeited   (78,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price   $ 26.93
Outstanding at June 30, 2012 3,633,000 3,633,000
Outstanding at June 30, 2012 (in Dollars per share) $ 18.80 $ 18.80
Outstanding at June 30, 2012 3 years 5 months  
Outstanding at June 30, 2012 (in Dollars) $ 56,311 $ 56,311
Exercisable at June 30, 2012 2,523,327 2,523,327
Exercisable at June 30, 2012 (in Dollars per share) $ 14.19 $ 14.19
Exercisable at June 30, 2012 2 years 7 months  
Exercisable at June 30, 2012 (in Dollars) $ 50,749 $ 50,749