Annual report pursuant to Section 13 and 15(d)

Summarized Information about Stock Options Outstanding and Exercisable (Detail)

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Summarized Information about Stock Options Outstanding and Exercisable (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2011
Year
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding Average Exercise Price $ 70.18
Options Exercisable Shares 10,773
Options Exercisable Average Exercise Price $ 70.19
Options Outstanding Shares 13,199
Options Outstanding Average Life (in years) 3.42
Range 1
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, lower limit $ 50.01
Exercise Price Range, upper limit $ 60.00
Options Outstanding Average Exercise Price $ 55.83
Options Exercisable Shares 109
Options Exercisable Average Exercise Price $ 55.83
Options Outstanding Shares 244
Options Outstanding Average Life (in years) 7.35
Range 2
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, lower limit $ 60.01
Exercise Price Range, upper limit $ 70.00
Options Outstanding Average Exercise Price $ 61.78
Options Exercisable Shares 3,246
Options Exercisable Average Exercise Price $ 61.57
Options Outstanding Shares 3,377
Options Outstanding Average Life (in years) 1.31
Range 3
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, lower limit $ 70.01
Exercise Price Range, upper limit $ 80.00
Options Outstanding Average Exercise Price $ 71.30
Options Exercisable Shares 5,218
Options Exercisable Average Exercise Price $ 71.34
Options Outstanding Shares 7,378
Options Outstanding Average Life (in years) 3.98
Range 4
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, lower limit $ 80.01
Exercise Price Range, upper limit $ 90.00
Options Outstanding Average Exercise Price $ 80.92
Options Exercisable Shares 2,200
Options Exercisable Average Exercise Price $ 80.92
Options Outstanding Shares 2,200
Options Outstanding Average Life (in years) 4.33