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Schedule of Weighted Average Remaining Contractual Life for Options Outstanding and Weighted Average Exercise Price Per Share for Exercisable Options (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares		9,639,949	8,770,133	8,400,183	7,897,451
Options Outstanding, Weighted Average Exercise Price Per Share		$ 112.40	$ 99.06	$ 80.50	$ 57.29
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		2 years 10 months 24 days
Number, Options Exercisable		2,869,346
Weighted Average Exercise Price, Options Exercisable		$ 100.51
Expected to Vest Options , Shares	[1]	5,031,122
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 118.17
Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range, Low		53.38
Range, High		$ 79.79
Options Outstanding, Shares		1,752,085
Options Outstanding, Weighted Average Exercise Price Per Share		$ 76.37
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		1 year 1 month 6 days
Number, Options Exercisable		1,173,671
Weighted Average Exercise Price, Options Exercisable		$ 75.48
Expected to Vest Options , Shares	[1]	565,589
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 78.17
Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range, Low		96.98
Range, High		$ 117.29
Options Outstanding, Shares		2,384,488
Options Outstanding, Weighted Average Exercise Price Per Share		$ 117.06
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		2 years 2 months 12 days
Number, Options Exercisable		1,070,813
Weighted Average Exercise Price, Options Exercisable		$ 117.12
Expected to Vest Options , Shares	[1]	1,152,681
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 117.05
Range Three
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range, Low		118.60
Range, High		$ 124.44
Options Outstanding, Shares		2,583,401
Options Outstanding, Weighted Average Exercise Price Per Share		$ 118.65
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		3 years 2 months 12 days
Number, Options Exercisable		605,862
Weighted Average Exercise Price, Options Exercisable		$ 118.65
Expected to Vest Options , Shares	[1]	1,549,346
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 118.65
Range Four
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range, Low		124.56
Range, High		$ 138.00
Options Outstanding, Shares		2,919,975
Options Outstanding, Weighted Average Exercise Price Per Share		$ 124.69
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		4 years 2 months 12 days
Number, Options Exercisable		19,000
Weighted Average Exercise Price, Options Exercisable		$ 131.62
Expected to Vest Options , Shares	[1]	1,763,506
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 124.67
[1] Assumes a weighted average forfeiture rate of 9.64%.

X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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

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