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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net Income (Loss)	$ 38,154	$ 27,415	$ 102,977	$ 80,793
Noncontrolling interests	(7,248)	4,265	(3,190)	1,348
Net Income (Loss) Attributable to Virtus Investment Partners, Inc.	$ 30,906	$ 31,680	$ 99,787	$ 82,141
Shares:
Basic: Weighted-average number of shares outstanding (in shares)	7,258	7,308	7,272	7,434
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	121	155	121	202
Diluted: Weighted-average number of shares outstanding (in shares)	7,379	7,463	7,393	7,636
Earnings (Loss) per Share—Basic (in dollars per share)	$ 4.26	$ 4.33	$ 13.72	$ 11.05
Earnings (Loss) per Share—Diluted (in dollars per share)	$ 4.19	$ 4.25	$ 13.50	$ 10.76