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Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2020
Risks and Uncertainties [Abstract]  
Summary of Funds Provided Ten Percent or More of Total Revenues The following client including the Company's sponsored funds provided 10 percent or more of the Company's investment management, administration and shareholder service fee revenues: 
202020192018
Virtus KAR Small Cap Growth Fund10%**
Virtus Newfleet Multi-Sector Short Term Bond Fund**10%
Virtus Vontobel Emerging Markets Opportunities Fund**10%
* Less than 10 percent of total revenues of the Company