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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net Income (Loss)	$ 27,415	$ 72,511	$ 80,793	$ 200,822
Noncontrolling interests	4,265	(13,775)	1,348	(42,531)
Net Income (Loss) Attributable to Virtus Investment Partners, Inc.	$ 31,680	$ 58,736	$ 82,141	$ 158,291
Shares (in thousands):
Basic: Weighted-average number of common shares outstanding (in shares)	7,308	7,691	7,434	7,688
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	155	293	202	340
Diluted: Weighted-average number of common shares outstanding (in shares)	7,463	7,984	7,636	8,028
Earnings (Loss) Per share—Basic (in dollars per share)	$ 4.33	$ 7.64	$ 11.05	$ 20.59
Earnings (Loss) Per Share—Diluted (in dollars per share)	$ 4.25	$ 7.36	$ 10.76	$ 19.72