Earnings (Loss) Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Net Income (Loss)	$ 135,988	$ 152,453	$ 141,476
Noncontrolling interests	2,408	(30,707)	(10,855)
Net Income (Loss) Attributable to Virtus Investment Partners, Inc.	$ 138,396	$ 121,746	$ 130,621
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic: Weighted-average number of shares outstanding (in shares)	6,829	7,082	7,249
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	100	128	126
Weighted Average Shares Outstanding—Diluted (in shares)	6,929	7,210	7,375
Earnings per share—basic (in dollars per share)	$ 20.27	$ 17.19	$ 18.02
Earnings per share—diluted (in dollars per share)	$ 19.97	$ 16.89	$ 17.71