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Stock Options Outstanding and Exercisable Price Range Status (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Shares 5,206
Options Exercisable, Shares 2,953
Exercise Price Range 1
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 14.50
Exercise Price Range, maximum $ 26.68
Options Outstanding, Shares 1,050
Options Outstanding, Weighted-Average Exercise Price $ 24.10
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 3 years 3 months 18 days
Options Exercisable, Shares 1,005
Options Exercisable, Weighted-Average Exercise Price $ 23.99
Exercise Price Range 2
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 26.73
Exercise Price Range, maximum $ 28.82
Options Outstanding, Shares 1,048
Options Outstanding, Weighted-Average Exercise Price $ 27.90
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 3 years 7 months 6 days
Options Exercisable, Shares 759
Options Exercisable, Weighted-Average Exercise Price $ 27.83
Exercise Price Range 3
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 28.86
Exercise Price Range, maximum $ 37.23
Options Outstanding, Shares 1,136
Options Outstanding, Weighted-Average Exercise Price $ 33.93
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 7 years 3 months 18 days
Options Exercisable, Shares 336
Options Exercisable, Weighted-Average Exercise Price $ 33.47
Exercise Price Range 4
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 37.39
Exercise Price Range, maximum $ 42.35
Options Outstanding, Shares 1,078
Options Outstanding, Weighted-Average Exercise Price $ 39.45
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 7 years 9 months 18 days
Options Exercisable, Shares 278
Options Exercisable, Weighted-Average Exercise Price $ 39.07
Exercise Price Range 5
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 43.13
Exercise Price Range, maximum $ 70.55
Options Outstanding, Shares 894
Options Outstanding, Weighted-Average Exercise Price $ 55.50
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 5 years 9 months 18 days
Options Exercisable, Shares 575
Options Exercisable, Weighted-Average Exercise Price $ 56.41