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Stock Option Activity and Related Information (Parenthetical) (Detail) shares in Millions	Dec. 31, 2015 shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options outstanding and expected to vest	12.6

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- References

No definition available.

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- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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