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 (in shares) at Dec. 31, 2023			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
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
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 (in shares) at Sep. 30, 2024			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
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 (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
Issuance of common shares related to employee stock transactions	0	0
Taxes paid on stock-based compensation	(827)	(827)		(827)
Stock-based compensation	5,692	5,692		5,692
Balance at end of period (in shares) at Sep. 30, 2024			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
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
Balance at beginning of period (in shares) at Dec. 31, 2024	6,967,147		6,967,147
Balance at beginning of period at Dec. 31, 2024	$ 901,636	897,493	$ 122	1,319,108	268,221	(364)	$ (689,594)	4,143
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2024	5,276,733						5,276,733
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 102,014	102,946			102,946			(932)
Foreign currency translation adjustments	962	962				962
Net subscriptions (redemptions) and other	321	2,457		2,457				(2,136)
Cash dividends declared, common	(48,846)	(48,846)			(48,846)
Repurchases of common shares (in shares)			(287,072)				287,072
Repurchases of common shares	(50,000)	(50,000)	$ 1	(1)			$ (50,000)
Issuance of common shares related to employee stock transactions (in shares)			73,369
Issuance of common shares related to employee stock transactions	0	0
Taxes paid on stock-based compensation	(7,639)	(7,639)		(7,639)
Stock-based compensation	$ 21,329	21,329		21,329
Balance at end of period (in shares) at Sep. 30, 2025	6,753,444		6,753,444
Balance at end of period at Sep. 30, 2025	$ 919,777	918,702	$ 123	1,335,254	322,321	598	$ (739,594)	1,075
Balance at end of period, treasury stock (in shares) at Sep. 30, 2025	5,563,805						5,563,805
Balance at Dec. 31, 2024	$ 107,282
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Net income (loss)	122
Net subscriptions (redemptions) and other	(4,213)
Balance at Sep. 30, 2025	103,191
Balance at beginning of period (in shares) at Jun. 30, 2025			6,748,088
Balance at beginning of period at Jun. 30, 2025	898,329	896,396	$ 123	1,327,872	307,409	586	$ (739,594)	1,933
Balance at beginning of period, treasury stock (in shares) at Jun. 30, 2025							5,563,805
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	31,320	31,926			31,926			(606)
Foreign currency translation adjustments	12	12				12
Net subscriptions (redemptions) and other	2,010	2,262		2,262				(252)
Cash dividends declared, common	(17,014)	(17,014)			(17,014)
Issuance of common shares related to employee stock transactions (in shares)			5,356
Issuance of common shares related to employee stock transactions	0	0
Taxes paid on stock-based compensation	(673)	(673)		(673)
Stock-based compensation	$ 5,793	5,793		5,793
Balance at end of period (in shares) at Sep. 30, 2025	6,753,444		6,753,444
Balance at end of period at Sep. 30, 2025	$ 919,777	$ 918,702	$ 123	$ 1,335,254	$ 322,321	$ 598	$ (739,594)	$ 1,075
Balance at end of period, treasury stock (in shares) at Sep. 30, 2025	5,563,805						5,563,805
Balance at Jun. 30, 2025	$ 123,097
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Net income (loss)	21
Net subscriptions (redemptions) and other	(19,927)
Balance at Sep. 30, 2025	$ 103,191