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Options Outstanding by Exercise Price Range (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
29.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price upper range limit	$ 29.49
Number of options, outstanding | shares	84
Weighted average remaining contractual life, outstanding (in years)	5 months 27 days
Weighted average exercise price, outstanding	$ 29.49
Number of options, exercisable | shares	84
Weighted average remaining contractual life, exercisable (in years)	5 months 27 days
Weighted average exercise price, exercisable	$ 29.49
43.95 - 49.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	43.95
Exercise price upper range limit	$ 49.50
Number of options, outstanding | shares	1,799
Weighted average remaining contractual life, outstanding (in years)	3 years 5 months 9 days
Weighted average exercise price, outstanding	$ 49.40
Number of options, exercisable | shares	1,469
Weighted average remaining contractual life, exercisable (in years)	3 years 5 months 5 days
Weighted average exercise price, exercisable	$ 49.39
51.98 - 55.95
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	$ 55.95
Number of options, outstanding | shares	3,219
Weighted average remaining contractual life, outstanding (in years)	2 years 1 month 10 days
Weighted average exercise price, outstanding	$ 53.82
Number of options, exercisable | shares	3,048
Weighted average remaining contractual life, exercisable (in years)	2 years 1 month 2 days
Weighted average exercise price, exercisable	$ 53.71
64.03 - 74.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	64.03
Exercise price upper range limit	$ 74.51
Number of options, outstanding | shares	3,180
Weighted average remaining contractual life, outstanding (in years)	4 years 9 months 4 days
Weighted average exercise price, outstanding	$ 67.18
Number of options, exercisable | shares	1,371
Weighted average remaining contractual life, exercisable (in years)	4 years 4 months 6 days
Weighted average exercise price, exercisable	$ 65.35
80.67 - 84.77
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	$ 84.77
Number of options, outstanding | shares	4,295
Weighted average remaining contractual life, outstanding (in years)	5 years 9 months 29 days
Weighted average exercise price, outstanding	$ 83.50
Number of options, exercisable | shares	1,353
Weighted average remaining contractual life, exercisable (in years)	5 years 7 months 28 days
Weighted average exercise price, exercisable	$ 83.60
29.49-84.77
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price lower range limit	29.49
Exercise price upper range limit	$ 84.77
Number of options, outstanding | shares	12,577
Weighted average remaining contractual life, outstanding (in years)	4 years 2 months 23 days
Weighted average exercise price, outstanding	$ 66.54
Number of options, exercisable | shares	7,325
Weighted average remaining contractual life, exercisable (in years)	3 years 5 months 1 day
Weighted average exercise price, exercisable	$ 60.27

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Name Accounting Standards Codification
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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