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Stock Option Activity and Related Information (Parenthetical) (Detail) shares in Millions | Dec. 31, 2016 shares
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Options outstanding and expected to vest | 12.5

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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 + Details
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