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Stock-Based Compensation (Detail) - (Table 4) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at January 1, 2012 2,703,000 2,703,000 2,423,000
Outstanding at January 1, 2012 (in Dollars per share) $ 17.79 $ 14.08 $ 9.12
Granted 236,000 618,000 971,000
Granted (in Dollars per share) $ 40.63 $ 29.93 $ 22.49
Exercised (583,000) (439,000) (647,000)
Exercised (in Dollars per share) $ 15.91 $ 11.39 $ 8.00
Cancelled/Forfeited (87,000) (179,000) (44,000)
Outstanding at June 30, 2012 2,269,000 2,703,000 2,703,000
Outstanding at June 30, 2012 (in Dollars per share) $ 20.57 $ 17.79 $ 14.08
Outstanding at June 30, 2012 4 years 0 months    
Outstanding at June 30, 2012 (in Dollars) $ 49,356    
Exercisable at June 30, 2012 1,111,000    
Exercisable at June 30, 2012 (in Dollars per share) $ 17.98    
Stock based compensation, shares exercisable, weighted average remaining contractual term 3 years 8 months    
Exercisable at June 30, 2012 (in Dollars) $ 26,972    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 20.10 $ 19.42 $ 16.03