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Activity Under All Stock Plan and Weighted Average Exercise Prices (Detail) (USD $)
In Thousands, except Per 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 [Line Items]      
Number of Shares/Units, Outstanding Beginning Balance 4,450 5,316 7,289
Number of Shares/Units, Granted         
Number of Shares/Units, Exercised (2,260) (806) (1,726)
Number of Shares/Units, Restrictions lapsed         
Number of Shares/Units, Forfeited (99) (60) (247)
Number of Shares/Units, Outstanding, Ending Balance 2,091 4,450 5,316
Weighted Average Grant Date Fair Value, Outstanding Beginning Balance $ 21.85 $ 22.04 $ 22.34
Weighted Average Exercise Price Per Share, Granted         
Weighted Average Exercise Price Per Share, Exercised $ 19.00 $ 22.73 $ 22.22
Weighted Average Grant Date Fair Value, Restrictions Lapsed         
Weighted Average Grant Date Fair Value, Forfeited $ 24.74 $ 26.05 $ 29.66
Weighted Average Grant Date Fair Value, Outstanding Ending Balance $ 24.80 $ 21.85 $ 22.04
Restricted Stock Plans
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares/Units, Outstanding Beginning Balance 2,915 3,996 5,369
Number of Shares/Units, Granted 1,454 1,402 1,545
Number of Shares/Units, Exercised         
Number of Shares/Units, Restrictions lapsed (1,790) (2,389) (2,722)
Number of Shares/Units, Forfeited (84) (94) (196)
Number of Shares/Units, Outstanding, Ending Balance 2,495 2,915 3,996
Weighted Average Grant Date Fair Value, Outstanding Beginning Balance $ 26.08 $ 23.44 $ 24.87
Weighted Average Exercise Price Per Share, Granted $ 28.36 $ 32.02 $ 26.81
Weighted Average Exercise Price Per Share, Exercised         
Weighted Average Grant Date Fair Value, Restrictions Lapsed $ 23.71 $ 25.27 $ 28.17
Weighted Average Grant Date Fair Value, Forfeited $ 28.84 $ 23.09 $ 23.48
Weighted Average Grant Date Fair Value, Outstanding Ending Balance $ 29.02 $ 26.08 $ 23.44