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Share-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |  |
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Dec. 31, 2017 USD ($) period $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Apr. 30, 2017 shares | Mar. 31, 2017 shares | Apr. 30, 2015 shares | Mar. 31, 2015 shares | Oct. 31, 2009 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercised under stock option plans | $ | $ 379.9 | $ 273.3 | $ 196.5 |  |  |  |  |
Cash received from option exercises and employee stock purchase plans | $ | $ 415.5 | 580.9 | 361.1 |  |  |  |  |
Number of options vested and expected to vest | 7,100,000 |  |  |  |  |  |  |
Weighted average remaining contractual life of shares vested and expected to vest, years | 5 years 6 months 25 days |  |  |  |  |  |  |
Aggregate intrinsic value of shares vested and expected to vest | $ | $ 1,429.6 |  |  |  |  |  |  |
Options vested and expected to vest, weighted-average exercise price per share | $ / shares | $ 162.50 |  |  |  |  |  |  |
Share-based compensation charges, income tax effect | $ | $ 49.2 | 56.1 | 51.8 |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | $ | 118.9 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation expense | $ | $ 278.9 |  |  |  |  |  |  |
Weighted average period unrecognized compensation expenses are expected to be recognized, years | 2 years 4 months 24 days |  |  |  |  |  |  |
Expected to vest (in shares) | 1,900,000 |  |  |  |  |  |  |
Aggregate intrinsic value | $ | $ 700.1 |  |  |  |  |  |  |
Canceled (shares) | 100,000 |  |  |  |  |  |  |
Vested in period, aggregate fair value | $ | $ 144.2 | $ 65.3 | $ 29.5 |  |  |  |  |
Restricted Stock Units (RSUs) | Employees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |  |  |  |
Share based vesting period | 4 years |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Director |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based vesting period | 1 year |  |  |  |  |  |  |
Annual Grant Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage vesting upon six months of service | 12.50% |  |  |  |  |  |  |
Percentage vesting per month after six months of service | 2.0833% |  |  |  |  |  |  |
New Hire Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage vesting upon one year of service | 25.00% |  |  |  |  |  |  |
Percentage vesting per month after one year | 2.0833% |  |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares were reserved for future issuance (shares) | 1,600,000 |  |  |  |  |  |  |
Minimum hours employed per week | 20 hours |  |  |  |  |  |  |
Minimum months employed per year | 5 months |  |  |  |  |  |  |
Maximum percentage of employees on stockholders to participate in ESPP | 5.00% |  |  |  |  |  |  |
Percentage of employee payroll deduction under the stock plan, maximum | 15.00% |  |  |  |  |  |  |
Duration for each offering period | 24 months |  |  |  |  |  |  |
Number of shorter purchase periods that each offering period is divided into | period | 4 |  |  |  |  |  |  |
Duration of each shorter offering period | 6 months |  |  |  |  |  |  |
Discount on fair market value on the offering date | 85.00% |  |  |  |  |  |  |
Discount on fair market value on the purchase date | 85.00% |  |  |  |  |  |  |
Period of look-back that could cause offering period to reset | 2 years |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  | 7,590,315 | 6,090,315 |  |  |
Employee stock purchase plan, shares issued | 200,000 | 200,000 | 300,000 |  |  |  |  |
Employee stock purchase plan, value of shares issued | $ | $ 38.3 | $ 32.5 | $ 31.2 |  |  |  |  |
Total unrecognized compensation expense | $ | $ 18.4 |  |  |  |  |  |  |
Weighted average period unrecognized compensation expenses are expected to be recognized, years | 1 year 6 months |  |  |  |  |  |  |
Nonvested Stock Option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation expense | $ | $ 69.9 |  |  |  |  |  |  |
Weighted average period unrecognized compensation expenses are expected to be recognized, years | 2 years 3 months 18 days |  |  |  |  |  |  |
Initial RSU grants | Director |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 33.3333% |  |  |  |  |  |
Share based vesting period |  | 3 years |  |  |  |  |  |
February Grant | Annual Grant Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage vesting upon six months of service | 12.50% |  |  |  |  |  |  |
Percentage vesting per month after six months of service | 2.0833% |  |  |  |  |  |  |
August Grant | Annual Grant Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage vesting at the end of one month | 14.5833% |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 2.0833% |  |  |  |  |  |  |
2010 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation, options, expiration term (in years) | 10 years |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (shares) |  |  |  | 24,450,000 | 21,150,000 |  |  |
Shares were reserved for future issuance (shares) | 6,200,000 |  |  |  |  |  |  |
2010 Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares were reserved for future issuance (shares) | 2,700,000 |  |  |  |  |  |  |
2010 Plan | February Grant | Annual Grant Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based vesting period | 4 years |  |  |  |  |  |  |
2010 Plan | August Grant | Annual Grant Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based vesting period | 3 years 6 months |  |  |  |  |  |  |
2009 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation, options, expiration term (in years) | 10 years |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (shares) |  |  |  |  |  | 4,365,000 | 3,465,000 |
Shares were reserved for future issuance (shares) | 43,000 |  |  |  |  |  |  |
2000 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation, options, expiration term (in years) | 10 years |  |  |  |  |  |  |
Minimum exercise price of NSOs, percentage of fair value | 85.00% |  |  |  |  |  |  |
2000 Non-Employee Directors' Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation, options, expiration term (in years) | 10 years |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (shares) |  |  |  |  |  |  |  | 450,000
Shares were reserved for future issuance (shares) | 100,000 |  |  |  |  |  |  |
2000 Non-Employee Directors' Stock Option Plan | Annual Grant Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based vesting period | 1 year |  |  |  |  |  |  |
2000 Non-Employee Directors' Stock Option Plan | Initial Grant Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage vesting upon one year of service |  | 33.3333% |  |  |  |  |  |
Percentage vesting per month after one year |  | 2.7778% |  |  |  |  |  |
Stock options granted initial vesting period, years |  | 3 years |  |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + 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 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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