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Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2019
Risks and Uncertainties [Abstract]  
Summary of Funds Provided Ten Percent or More of Total Revenues The following funds provided 10 percent or more of the total revenues of the Company in fiscal 2018 and 2017: 
 
 
 
(in thousands)
 
2018
 
2017
Virtus Newfleet Multi-Sector Short Term Bond Fund
 
 
 
 
Investment management, administration and shareholder service fees
 
$
54,257

 
$
44,577

Percent of total revenues
 
10
%
 
11
%
Virtus Vontobel Emerging Markets Opportunities Fund
 
 
 
 
Investment management, administration and shareholder service fees
 
$
52,548

 
$
48,826

Percent of total revenues
 
10
%
 
12
%