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Recent Accounting Pronouncements - Additional Information (Detail) - ASU 2016-09 [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
Recognition of an excess tax benefit and deficiency | $ 1.1
Increase in annual effective tax rate due to recognition of an excess tax benefit and deficiency | 3.20%

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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=96867065&loc=d3e5070-113901 + Details
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