Earnings (Loss) Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Abstract]
Net Income (Loss)	$ 31,341	$ 49,104	$ 102,136	$ 112,993
Noncontrolling interests	585	(8,124)	810	(24,541)
Net Income (Loss) Attributable to Virtus Investment Partners, Inc.	$ 31,926	$ 40,980	$ 102,946	$ 88,452
Shares:
Basic: Weighted-average number of shares outstanding (in shares)	6,757	7,071	6,854	7,105
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	110	105	99	129
Diluted: Weighted-average number of shares outstanding (in shares)	6,867	7,176	6,953	7,234
Earnings (Loss) per Share—Basic (in dollars per share)	$ 4.73	$ 5.80	$ 15.02	$ 12.45
Earnings (Loss) per Share—Diluted (in dollars per share)	$ 4.65	$ 5.71	$ 14.81	$ 12.23