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, 2020			7,583,466
Balance at beginning of period at Dec. 31, 2020	$ 720,940	$ 711,141	$ 118	$ 1,298,002	$ (135,259)	$ 29	$ (451,749)	$ 9,799
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2020							4,207,403
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)
Cash dividends declared	(25,315)	(25,315)		(25,315)
Repurchases of common shares (in shares)			(111,327)				111,327
Repurchases of common shares	(32,499)	(32,499)					$ (32,499)
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
Balance at end of period, common stock (in shares) at Sep. 30, 2021			7,587,757
Balance at end of period at Sep. 30, 2021	821,110	812,297	$ 119	1,273,376	23,032	18	$ (484,248)	8,813
Balance at end of period, treasury stock (in shares) at Sep. 30, 2021							4,318,730
Balance at beginning of period 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)
Balance at end of period at Sep. 30, 2021	131,669
Balance at beginning of period, common stock (in shares) at Jun. 30, 2021			7,651,606
Balance at beginning of period at Jun. 30, 2021	789,837	780,869	$ 119	1,280,667	(35,704)	35	$ (464,248)	8,968
Balance at beginning of period, treasury stock (in shares) at Jun. 30, 2021							4,254,236
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)	0						(529)
Cash dividends declared	(12,015)	(12,015)		(12,015)
Repurchases of common shares (in shares)			(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	0
Taxes paid on stock-based compensation	(148)	(148)		(148)
Stock-based compensation	4,872	4,872		4,872
Balance at end of period, common stock (in shares) at Sep. 30, 2021			7,587,757
Balance at end of period at Sep. 30, 2021	821,110	812,297	$ 119	1,273,376	23,032	18	$ (484,248)	8,813
Balance at end of period, treasury stock (in shares) at Sep. 30, 2021							4,318,730
Balance at beginning of period 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)
Balance at end of period at Sep. 30, 2021	$ 131,669
Balance at beginning of period, common stock (in shares) at Dec. 31, 2021	11,906,747		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						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	$ (35,779)	(35,779)			(35,779)
Repurchases of common shares (in shares)	(397,777)		(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	12,030,346		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						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	$ (12,552)	(12,552)			(12,552)
Repurchases of common shares (in shares)	(50,422)		(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	12,030,346		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						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