Common Stock and Stockholders' Equity - Additional Information (Detail) shares in Millions, $ in Billions	1 Months Ended	3 Months Ended
Mar. 31, 2017 shares	Apr. 30, 2018 USD ($) vote / shares shares
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of which options become exercisable		10 years
Period of vesting		5 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of vesting		4 years
Unrecognized compensation cost - other than options \| $		$ 1.4
Unrecognized compensation cost recognized over weighted-average period		3 years 1 month
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, outstanding (in shares)		146
Common stock, votes per share \| vote / shares		1
Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, outstanding (in shares)		69
Common stock, votes per share \| vote / shares		10
2012 Equity Incentive Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share reserve increased (in shares)	11
Common stock available for future grants (in shares)		67
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for future grants (in shares)		7
Percentage of fair market value of stock at which employees are granted shares		85.00%

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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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

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

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+ 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

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Common Stock Voting Rights Per Share

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Share based compensation arrangement by share based payment award maximum exercise period.

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