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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%.

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- 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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