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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($)
Accounting Standards Update 2016-09 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Excess tax benefits recognized in provision for income taxes | $ 1.5

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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=6415400&loc=d3e5070-113901 + Details
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