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, 2022			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
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			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
Balance at Dec. 31, 2022	113,718
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Net income (loss)	2,404
Net subscriptions (redemptions) and other	(19,856)
Balance 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
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			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
Balance at Jun. 30, 2023	110,399
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Net income (loss)	6,577
Net subscriptions (redemptions) and other	(20,710)
Balance at Sep. 30, 2023	$ 96,266
Balance at beginning of period, common stock (in shares) at Dec. 31, 2023	12,163,228		7,087,728
Balance at beginning of period at Dec. 31, 2023	$ 868,289	863,926	$ 122	1,300,999	207,356	(87)	$ (644,464)	4,363
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2023	5,075,500						5,075,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 88,571	88,452			88,452			119
Foreign currency translation adjustments	317	317				317
Net subscriptions (redemptions) and other	4,443	5,249		5,249				(806)
Cash dividends declared, common	(44,510)	(44,510)			(44,510)
Repurchases of common shares (in shares)			(149,057)				149,057
Repurchases of common shares	(32,368)	(32,368)					$ (32,368)
Issuance of common shares related to employee stock transactions (in shares)			77,762
Issuance of common shares related to employee stock transactions	0	0	$ 0	0
Taxes paid on stock-based compensation	(11,271)	(11,271)		(11,271)
Stock-based compensation	$ 19,251	19,251		19,251
Balance at end of period, common stock (in shares) at Sep. 30, 2024	12,240,990		7,016,433
Balance at end of period at Sep. 30, 2024	$ 892,722	889,046	$ 122	1,314,228	251,298	230	$ (676,832)	3,676
Balance at end of period, treasury stock (in shares) at Sep. 30, 2024	5,224,557						5,224,557
Balance at Dec. 31, 2023	$ 104,869
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Net income (loss)	24,422
Net subscriptions (redemptions) and other	(31,180)
Balance at Sep. 30, 2024	98,111
Balance at beginning of period, common stock (in shares) at Jun. 30, 2024			7,082,071
Balance at beginning of period at Jun. 30, 2024	872,118	868,675	$ 122	1,304,176	226,540	(200)	$ (661,963)	3,443
Balance at beginning of period, treasury stock (in shares) at Jun. 30, 2024							5,151,707
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	41,381	40,980			40,980			401
Foreign currency translation adjustments	430	430				430
Net subscriptions (redemptions) and other	5,019	5,187		5,187				(168)
Cash dividends declared, common	(16,222)	(16,222)			(16,222)
Repurchases of common shares (in shares)			(72,850)				72,850
Repurchases of common shares	(14,869)	(14,869)					$ (14,869)
Issuance of common shares related to employee stock transactions (in shares)			7,212
Taxes paid on stock-based compensation	(827)	(827)		(827)
Stock-based compensation	$ 5,692	5,692		5,692
Balance at end of period, common stock (in shares) at Sep. 30, 2024	12,240,990		7,016,433
Balance at end of period at Sep. 30, 2024	$ 892,722	$ 889,046	$ 122	$ 1,314,228	$ 251,298	$ 230	$ (676,832)	$ 3,676
Balance at end of period, treasury stock (in shares) at Sep. 30, 2024	5,224,557						5,224,557
Balance at Jun. 30, 2024	$ 129,450
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Net income (loss)	7,723
Net subscriptions (redemptions) and other	(39,062)
Balance at Sep. 30, 2024	$ 98,111