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Activity Under All Stock Plans and Weighted Average Exercise Prices (Detail) (USD $)
In Thousands, except Per 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 [Line Items]      
Number of Shares/Units, Outstanding Beginning Balance 2,091 4,450 5,316
Number of Shares/Units, Granted         
Number of Shares/Units, Exercised (1,397) (2,260) (806)
Number of Shares/Units, Restrictions lapsed         
Number of Shares/Units, Forfeited (62) (99) (60)
Number of Shares/Units, Outstanding, Ending Balance 632 2,091 4,450
Weighted Average Exercise Price Per Share, Outstanding Beginning Balance $ 24.80 $ 21.85 $ 22.04
Weighted Average Exercise Price Per Share, Granted         
Weighted Average Exercise Price Per Share, Exercised $ 23.82 $ 19.00 $ 22.73
Weighted Average Exercise Price Per Share, Restrictions lapsed         
Weighted Average Exercise Price Per Share, Forfeited $ 20.48 $ 24.74 $ 26.05
Weighted Average Exercise Price Per Share, Outstanding Ending Balance $ 27.41 $ 24.80 $ 21.85
Without Market Conditions [Member] | Restricted stock and stock units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares/Units, Outstanding Beginning Balance 1,737 2,392 3,996
Number of Shares/Units, Granted 688 937 879
Number of Shares/Units, Exercised         
Number of Shares/Units, Restrictions lapsed (1,087) (1,550) (2,389)
Number of Shares/Units, Forfeited (21) (42) (94)
Number of Shares/Units, Outstanding, Ending Balance 1,317 1,737 2,392
Weighted Average Grant Date Fair Value, Outstanding Beginning Balance $ 28.25 $ 24.47 $ 23.44
Weighted Average Grant Date Fair Value, Granted $ 35.34 $ 27.71 $ 31.18
Weighted Average Grant Date Fair Value, Exercised         
Weighted Average Grant Date Fair Value, Restrictions lapsed $ 28.53 $ 22.20 $ 25.57
Weighted Average Grant Date Fair Value, Forfeited $ 31.29 $ 24.26 $ 23.09
Weighted Average Grant Date Fair Value, Outstanding Ending Balance $ 31.68 $ 28.25 $ 24.47
With Market Conditions [Member] | Restricted stock and stock units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares/Units, Outstanding Beginning Balance 758 523   
Number of Shares/Units, Granted 400 517 523
Number of Shares/Units, Exercised         
Number of Shares/Units, Restrictions lapsed (259) (240)  
Number of Shares/Units, Forfeited   (42)  
Number of Shares/Units, Outstanding, Ending Balance 899 758 523
Weighted Average Grant Date Fair Value, Outstanding Beginning Balance $ 30.77 $ 33.42   
Weighted Average Grant Date Fair Value, Granted $ 42.04 $ 29.53 $ 33.42
Weighted Average Grant Date Fair Value, Exercised         
Weighted Average Grant Date Fair Value, Restrictions lapsed $ 29.53 $ 33.42  
Weighted Average Grant Date Fair Value, Forfeited   $ 33.42  
Weighted Average Grant Date Fair Value, Outstanding Ending Balance $ 36.58 $ 30.77 $ 33.42