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Concentration of Credit Risk - Summary of Funds Provided Ten Percent or More of Total Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Virtus Newfleet Multi-Sector Short Term Bond Fund |  |
Concentration Risk [Line Items] |  |
Investment management, administration and shareholder service fees | $ 54,257 | $ 44,577
Virtus Vontobel Emerging Markets Opportunities Fund |  |
Concentration Risk [Line Items] |  |
Investment management, administration and shareholder service fees | $ 52,548 | $ 48,826
Revenue Benchmark | Virtus Newfleet Multi-Sector Short Term Bond Fund |  |
Concentration Risk [Line Items] |  |
Percent of total revenues | 10.00% | 11.00%
Revenue Benchmark | Virtus Vontobel Emerging Markets Opportunities Fund |  |
Concentration Risk [Line Items] |  |
Percent of total revenues | 10.00% | 12.00%

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