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Future Accounting Matters - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2017
Accounting Standards Update (ASU) 2016-09, Compensation - Stock Compensation [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Tax benefit associated with compensation expense | $ 208,000 | $ 227,000

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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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