Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Total Attributed To Virtus Investment Partners, Inc.	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Non- controlling Interests
Balance at beginning of period, common stock (in shares) at Dec. 31, 2021			7,506,151
Balance at beginning of period at Dec. 31, 2021	$ 836,627	$ 828,277	$ 119	$ 1,276,424	$ 60,962	$ 20	$ (509,248)	$ 8,350
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2021							4,400,596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	81,957	82,141			82,141			(184)
Foreign currency translation adjustments	(791)	(791)				(791)
Net subscriptions (redemptions) and other	603	2,035		2,035				(1,432)
Cash dividends declared, common	(35,779)	(35,779)			(35,779)
Repurchases of common shares (in shares)			397,777				397,777
Repurchases of common shares	(80,000)	(80,000)					$ (80,000)
Issuance of common shares related to employee stock transactions (in shares)			123,599
Issuance of common shares related to employee stock transactions	0	0	$ 1	(1)
Taxes paid on stock-based compensation	(16,450)	(16,450)		(16,450)
Stock-based compensation	19,772	19,772		19,772
Balance at end of period, common stock (in shares) at Sep. 30, 2022			7,231,973
Balance at end of period at Sep. 30, 2022	805,939	799,205	$ 120	1,281,780	107,324	(771)	$ (589,248)	6,734
Balance at end of period, treasury stock (in shares) at Sep. 30, 2022							4,798,373
Balance at beginning of period at Dec. 31, 2021	138,965
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Total net income (loss) attributable to noncontrolling interests	(1,164)
Net subscriptions (redemptions) and other	(13,359)
Balance at end of period at Sep. 30, 2022	124,442
Balance at beginning of period, common stock (in shares) at Jun. 30, 2022			7,275,337
Balance at beginning of period at Jun. 30, 2022	791,705	784,708	$ 120	1,275,907	88,196	(267)	$ (579,248)	6,997
Balance at beginning of period, treasury stock (in shares) at Jun. 30, 2022							4,747,951
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	31,831	31,680			31,680			151
Foreign currency translation adjustments	(504)	(504)				(504)
Net subscriptions (redemptions) and other	1,621	2,035		2,035				(414)
Cash dividends declared, common	(12,552)	(12,552)			(12,552)
Repurchases of common shares (in shares)			50,422				50,422
Repurchases of common shares	(10,000)	(10,000)					$ (10,000)
Issuance of common shares related to employee stock transactions (in shares)			7,058
Issuance of common shares related to employee stock transactions	0	0
Taxes paid on stock-based compensation	(1,166)	(1,166)		(1,166)
Stock-based compensation	5,004	5,004		5,004
Balance at end of period, common stock (in shares) at Sep. 30, 2022			7,231,973
Balance at end of period at Sep. 30, 2022	805,939	799,205	$ 120	1,281,780	107,324	(771)	$ (589,248)	6,734
Balance at end of period, treasury stock (in shares) at Sep. 30, 2022							4,798,373
Balance at beginning of period at Jun. 30, 2022	139,147
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Total net income (loss) attributable to noncontrolling interests	(4,416)
Net subscriptions (redemptions) and other	(10,289)
Balance at end of period at Sep. 30, 2022	$ 124,442
Balance at beginning of period, common stock (in shares) at Dec. 31, 2022	12,033,247		7,181,554
Balance at beginning of period at Dec. 31, 2022	$ 822,936	817,019	$ 120	1,286,244	130,261	(358)	$ (599,248)	5,917
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2022	4,851,693						4,851,693
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 100,573	99,787			99,787			786
Foreign currency translation adjustments	(15)	(15)				(15)
Net subscriptions (redemptions) and other	1,963	3,218		3,218				(1,255)
Cash dividends declared, common	(39,433)	(39,433)			(39,433)
Repurchases of common shares (in shares)			125,855				125,855
Repurchases of common shares	(25,000)	(25,000)					$ (25,000)
Issuance of common shares related to employee stock transactions (in shares)			127,064
Issuance of common shares related to employee stock transactions	0	0	$ 2	(2)
Taxes paid on stock-based compensation	(13,436)	(13,436)		(13,436)
Stock-based compensation	$ 19,964	19,964		19,964
Balance at end of period, common stock (in shares) at Sep. 30, 2023	12,160,311		7,182,763
Balance at end of period at Sep. 30, 2023	$ 867,552	862,104	$ 122	1,295,988	190,615	(373)	$ (624,248)	5,448
Balance at end of period, treasury stock (in shares) at Sep. 30, 2023	4,977,548						4,977,548
Balance at beginning of period at Dec. 31, 2022	$ 113,718
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Total net income (loss) attributable to noncontrolling interests	2,404
Net subscriptions (redemptions) and other	(19,856)
Balance at end of period at Sep. 30, 2023	96,266
Balance at beginning of period, common stock (in shares) at Jun. 30, 2023			7,254,786
Balance at beginning of period at Jun. 30, 2023	856,709	851,513	$ 122	1,286,775	174,011	(147)	$ (609,248)	5,196
Balance at beginning of period, treasury stock (in shares) at Jun. 30, 2023							4,903,533
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	31,577	30,906			30,906			671
Foreign currency translation adjustments	(226)	(226)				(226)
Net subscriptions (redemptions) and other	2,799	3,218		3,218				(419)
Cash dividends declared, common	(14,302)	(14,302)			(14,302)
Repurchases of common shares (in shares)			74,015				74,015
Repurchases of common shares	(15,000)	(15,000)					$ (15,000)
Issuance of common shares related to employee stock transactions (in shares)			1,992
Issuance of common shares related to employee stock transactions	0	0
Taxes paid on stock-based compensation	(214)	(214)		(214)
Stock-based compensation	$ 6,209	6,209		6,209
Balance at end of period, common stock (in shares) at Sep. 30, 2023	12,160,311		7,182,763
Balance at end of period at Sep. 30, 2023	$ 867,552	$ 862,104	$ 122	$ 1,295,988	$ 190,615	$ (373)	$ (624,248)	$ 5,448
Balance at end of period, treasury stock (in shares) at Sep. 30, 2023	4,977,548						4,977,548
Balance at beginning of period at Jun. 30, 2023	$ 110,399
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Total net income (loss) attributable to noncontrolling interests	6,577
Net subscriptions (redemptions) and other	(20,710)
Balance at end of period at Sep. 30, 2023	$ 96,266