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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net Income (Loss)	$ 14,259	$ 76,097	$ 53,378	$ 128,311
Noncontrolling interests	3,143	(13,130)	(2,917)	(28,756)
Net Income (Loss) Attributable to Virtus Investment Partners, Inc.	$ 17,402	$ 62,967	$ 50,461	$ 99,555
Shares (in thousands):
Basic: Weighted-average number of common shares outstanding (in shares)	7,449	7,698	7,496	7,674
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	158	309	225	364
Diluted: Weighted-average number of common shares outstanding (in shares)	7,607	8,007	7,721	8,038
Earnings (Loss) Per share—Basic (in dollars per share)	$ 2.34	$ 8.18	$ 6.73	$ 12.97
Earnings (Loss) Per Share—Diluted (in dollars per share)	$ 2.29	$ 7.86	$ 6.54	$ 12.39