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Concentration of Credit Risk - Summary of Funds Provided Ten Percent or More of Total Revenues (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Virtus Emerging Markets Opportunities Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | $ 49,085 | $ 62,329 | $ 50,435
Virtus Multi-Sector Short Term Bond Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | $ 43,579 | $ 49,174 | $ 55,401
Sales Revenue, Services, Net [Member] | Virtus Emerging Markets Opportunities Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenues | 15.00% | 16.00% | 11.00%
Sales Revenue, Services, Net [Member] | Virtus Multi-Sector Short Term Bond Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenues | 14.00% | 13.00% | 12.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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