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Business Combination - Additional Information (Detail) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Apr. 10, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Business Acquisition [Line Items] |  |  |
Intangibles acquired in business combination |  | $ 2,400 | $ 1,075
Virtus ETF Solutions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Investment to acquire majority interest | $ 4,800 |  |
Goodwill acquired in business combination | 1,400 |  |
Intangibles acquired in business combination | $ 2,400 |  |

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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