Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Income (Loss)	$ 39,119	$ 52,214
Noncontrolling interests	(6,060)	(15,626)
Net Income (Loss) Attributable to Virtus Investment Partners, Inc.	$ 33,059	$ 36,588
Shares (in thousands):
Basic: Weighted-average number of common shares outstanding (in shares)	7,546	7,633
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	293	419
Diluted: Weighted-average number of common shares outstanding (in shares)	7,839	8,052
Earnings (Loss) Per share—Basic (in dollars per share)	$ 4.38	$ 4.79
Earnings (Loss) Per Share—Diluted (in dollars per share)	$ 4.22	$ 4.54