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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, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Shares 4,357
Options Exercisable, Shares 2,286
Exercise Price Range 1
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 16.80
Exercise Price Range, maximum $ 27.89
Options Outstanding, Shares 905
Options Outstanding, Weighted-Average Exercise Price $ 25.26
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 2 years 7 months 6 days
Options Exercisable, Shares 868
Options Exercisable, Weighted-Average Exercise Price $ 25.20
Exercise Price Range 2
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 27.96
Exercise Price Range, maximum $ 34.62
Options Outstanding, Shares 968
Options Outstanding, Weighted-Average Exercise Price $ 31.99
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 7 years 1 month 6 days
Options Exercisable, Shares 185
Options Exercisable, Weighted-Average Exercise Price $ 30.28
Exercise Price Range 3
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 35.18
Exercise Price Range, maximum $ 38.58
Options Outstanding, Shares 1,137
Options Outstanding, Weighted-Average Exercise Price $ 37.31
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 6 years 10 months 24 days
Options Exercisable, Shares 406
Options Exercisable, Weighted-Average Exercise Price $ 37.51
Exercise Price Range 4
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 38.88
Exercise Price Range, maximum $ 54.30
Options Outstanding, Shares 885
Options Outstanding, Weighted-Average Exercise Price $ 44.24
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 6 years 3 months 18 days
Options Exercisable, Shares 462
Options Exercisable, Weighted-Average Exercise Price $ 46.10
Exercise Price Range 5
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, minimum $ 55.63
Exercise Price Range, maximum $ 70.55
Options Outstanding, Shares 462
Options Outstanding, Weighted-Average Exercise Price $ 62.27
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 4 years 6 months
Options Exercisable, Shares 365
Options Exercisable, Weighted-Average Exercise Price $ 62.05