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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Virtus Emerging Markets Opportunities Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | $ 62,329 | $ 50,435 | $ 53,202
Virtus Multi-Sector Short Term Bond Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | 49,174 | 55,401 | 52,568
Virtus Equity Trend Fund (formerly Virtus Premium AlphaSector Fund) [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | $ 30,398 | $ 61,566 | $ 41,921
Sales Revenue, Services, Net [Member] | Virtus Emerging Markets Opportunities Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenues | 16.00% | 11.00% | 14.00%
Sales Revenue, Services, Net [Member] | Virtus Multi-Sector Short Term Bond Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenues | 13.00% | 12.00% | 14.00%
Sales Revenue, Services, Net [Member] | Virtus Equity Trend Fund (formerly Virtus Premium AlphaSector Fund) [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenues | 8.00% | 14.00% | 11.00%

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