Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Total Attributed To Virtus Investment Partners, Inc.	Common Stock	Preferred Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Non- controlling Interests
Beginning Balance (in shares) at Dec. 31, 2019			6,809,280	1,150,000				3,927,607
Beginning Balance at Dec. 31, 2019	$ 686,257	$ 675,699	$ 107	$ 110,843	$ 1,199,205	$ (215,216)	$ 9	$ (419,249)	$ 10,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	36,496	36,642				36,642			(146)
Foreign currency translation adjustments	(9)	(9)					(9)
Net subscriptions (redemptions) and other	(1,597)	(167)			(167)				(1,430)
Cash dividends declared, common	(18,371)	(18,371)			(18,371)
Repurchases of common shares (in shares)			(239,720)					239,720
Repurchases of common shares	(25,000)	(25,000)						$ (25,000)
Conversion of preferred stock (in shares)			912,806	(1,150,000)
Conversion of preferred stock	0		$ 9	$ (110,843)	110,834
Issuance of common shares related to employee stock transactions (in shares)			130,788
Issuance of common shares related to employee stock transactions	163	163	$ 2		161
Taxes paid on stock-based compensation	(5,693)	(5,693)			(5,693)
Stock-based compensation	15,766	15,766			15,766
Ending Balance (in shares) at Sep. 30, 2020			7,613,154	0				4,167,327
Ending Balance at Sep. 30, 2020	688,012	679,030	$ 118	$ 0	1,301,735	(178,574)	0	$ (444,249)	8,982
Beginning Balance at Dec. 31, 2019	63,845
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Total net income (loss) attributable to noncontrolling interests	21,653
Net subscriptions (redemptions) and other	13,779
Ending Balance at Sep. 30, 2020	99,277
Beginning Balance (in shares) at Jun. 30, 2020			7,664,272					4,113,460
Beginning Balance at Jun. 30, 2020	666,511	658,166	$ 118		1,303,036	(208,222)	(17)	$ (436,749)	8,345
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	30,625	29,648				29,648			977
Foreign currency translation adjustments	17	17					17
Net subscriptions (redemptions) and other	(340)	0			0				(340)
Cash dividends declared, common	(6,695)	(6,695)			(6,695)
Repurchases of common shares (in shares)			(53,867)					53,867
Repurchases of common shares	(7,500)	(7,500)						$ (7,500)
Issuance of common shares related to employee stock transactions (in shares)			2,749
Issuance of common shares related to employee stock transactions	49	49	$ 0		49
Taxes paid on stock-based compensation	(124)	(124)			(124)
Stock-based compensation	5,469	5,469			5,469
Ending Balance (in shares) at Sep. 30, 2020			7,613,154	0				4,167,327
Ending Balance at Sep. 30, 2020	688,012	679,030	$ 118	$ 0	1,301,735	(178,574)	0	$ (444,249)	8,982
Beginning Balance at Jun. 30, 2020	90,687
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Total net income (loss) attributable to noncontrolling interests	10,309
Net subscriptions (redemptions) and other	(1,719)
Ending Balance at Sep. 30, 2020	99,277
Beginning Balance (in shares) at Dec. 31, 2020			7,583,466	0				4,207,403
Beginning Balance at Dec. 31, 2020	720,940	711,141	$ 118	$ 0	1,298,002	(135,259)	29	$ (451,749)	9,799
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	159,010	158,291				158,291			719
Foreign currency translation adjustments	(11)	(11)					(11)
Net subscriptions (redemptions) and other	$ (1,705)								(1,705)
Repurchases of common shares (in shares)	(111,327)		(111,327)					111,327
Repurchases of common shares	$ (32,499)	(32,499)						$ (32,499)
Cash dividends declared, preferred	(25,315)	(25,315)			(25,315)
Issuance of common shares related to employee stock transactions (in shares)			115,618
Issuance of common shares related to employee stock transactions	66	66	$ 1		65
Taxes paid on stock-based compensation	(19,428)	(19,428)			(19,428)
Stock-based compensation	20,052	20,052			20,052
Ending Balance (in shares) at Sep. 30, 2021			7,587,757	0				4,318,730
Ending Balance at Sep. 30, 2021	821,110	812,297	$ 119	$ 0	1,273,376	23,032	18	$ (484,248)	8,813
Beginning Balance at Dec. 31, 2020	115,513
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Total net income (loss) attributable to noncontrolling interests	41,812
Net subscriptions (redemptions) and other	(25,656)
Ending Balance at Sep. 30, 2021	131,669
Beginning Balance (in shares) at Jun. 30, 2021			7,651,606					4,254,236
Beginning Balance at Jun. 30, 2021	789,837	780,869	$ 119		1,280,667	(35,704)	35	$ (464,248)	8,968
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	59,110	58,736				58,736			374
Foreign currency translation adjustments	(17)	(17)					(17)
Net subscriptions (redemptions) and other	(529)								(529)
Cash dividends declared, common	$ (12,015)	(12,015)			(12,015)
Repurchases of common shares (in shares)	(64,494)		(64,494)					64,494
Repurchases of common shares	$ (20,000)	(20,000)						$ (20,000)
Issuance of common shares related to employee stock transactions (in shares)			645
Issuance of common shares related to employee stock transactions			$ 0
Taxes paid on stock-based compensation	(148)	(148)			(148)
Stock-based compensation	4,872	4,872			4,872
Ending Balance (in shares) at Sep. 30, 2021			7,587,757	0				4,318,730
Ending Balance at Sep. 30, 2021	821,110	$ 812,297	$ 119	$ 0	$ 1,273,376	$ 23,032	$ 18	$ (484,248)	$ 8,813
Beginning Balance at Jun. 30, 2021	131,525
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Total net income (loss) attributable to noncontrolling interests	13,401
Net subscriptions (redemptions) and other	(13,257)
Ending Balance at Sep. 30, 2021	$ 131,669