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Options Outstanding by Exercise Price Range (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range limit $ 26.47
Exercise price upper range limit $ 83.59
Number of options, outstanding | shares 12,739
Weighted average remaining contractual life, outstanding (in years) 4 years 1 month 2 days
Weighted average exercise price, outstanding $ 57.69
Number of options, exercisable | shares 7,798
Weighted average remaining contractual life, exercisable (in years) 3 years 3 months 22 days
Weighted average exercise price, exercisable $ 50.82
26.47 - 35.79  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range limit 26.47
Exercise price upper range limit $ 35.79
Number of options, outstanding | shares 1,718
Weighted average remaining contractual life, outstanding (in years) 1 year 5 months 19 days
Weighted average exercise price, outstanding $ 29.65
Number of options, exercisable | shares 1,688
Weighted average remaining contractual life, exercisable (in years) 1 year 5 months 19 days
Weighted average exercise price, exercisable $ 29.54
42.85 - 49.50  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range limit 42.85
Exercise price upper range limit $ 49.50
Number of options, outstanding | shares 1,829
Weighted average remaining contractual life, outstanding (in years) 4 years 5 months 5 days
Weighted average exercise price, outstanding $ 49.31
Number of options, exercisable | shares 1,159
Weighted average remaining contractual life, exercisable (in years) 4 years 5 months 1 day
Weighted average exercise price, exercisable $ 49.29
51.98 - 53.67  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range limit 51.98
Exercise price upper range limit $ 53.67
Number of options, outstanding | shares 3,625
Weighted average remaining contractual life, outstanding (in years) 2 years 10 months 21 days
Weighted average exercise price, outstanding $ 53.31
Number of options, exercisable | shares 3,305
Weighted average remaining contractual life, exercisable (in years) 2 years 10 months 2 days
Weighted average exercise price, exercisable $ 53.27
55.15 - 74.51  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range limit 55.15
Exercise price upper range limit $ 74.51
Number of options, outstanding | shares 3,142
Weighted average remaining contractual life, outstanding (in years) 4 years 11 months 12 days
Weighted average exercise price, outstanding $ 63.52
Number of options, exercisable | shares 1,226
Weighted average remaining contractual life, exercisable (in years) 5 years 4 days
Weighted average exercise price, exercisable $ 63.77
80.67 - 83.59  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range limit 80.67
Exercise price upper range limit $ 83.59
Number of options, outstanding | shares 2,425
Weighted average remaining contractual life, outstanding (in years) 6 years 4 months 6 days
Weighted average exercise price, outstanding $ 82.90
Number of options, exercisable | shares 420
Weighted average remaining contractual life, exercisable (in years) 6 years 5 months 9 days
Weighted average exercise price, exercisable $ 83.59