Employee Share Purchase Plan, Yearly Increase in Shares Available for Grant, Percent

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- Definition

Minimum percentage of fair value of grant.

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- Definition

Percentage Of Fair Market Value Of Common Stock On Grant Date

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Extension Approval

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Offering Interval

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Offering Period

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No definition available.

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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.

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-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions				1 Months Ended			12 Months Ended
	Nov. 10, 2015	Nov. 25, 2014	May 31, 2000	Jun. 30, 2004	Sep. 30, 2001	May 31, 2000	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense not yet recognized							$ 337.8
Expected recognized period (in years)							2 years 1 month 21 days
Capitalized stock-based compensation expense							$ 9.1	$ 6.2	$ 4.2
2000 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value of common stock on the grant date			85.00%			100.00%
Vesting period (in years)						4 years
Number of shares in reserve							16,636,172
Number of shares available for grant							1,892,262
2000 Director Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares in reserve							594,403
Number of shares available for grant							505,646
2001 Supplemental Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)					4 years
Number of shares in reserve							1,494,275
Number of shares available for grant							260,498
Minimum percentage of fair value of grant					85.00%
Common stock employee purchase plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares in reserve				500,000
Number of shares available for grant							3,120,425
Yearly increase in shares available for grant (percent)				2.00%
Number of additional shares authorized	9,020	3,197
Percentage of purchase price reductions				15.00%
Offering period (in months)				24 months
Offering interval (in months)				6 months
Purchase discount from market price (percent)				85.00%
Extension period (in months)							12 months
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vested and released, net							$ 249.8	$ 259.1	$ 227.4