Condensed Consolidated Statements of Changes in Partners' Capital - USD ($) $ in Thousands	Total	Receivables from Affiliates	AB Holding Units held for Long-term Incentive Compensation Plans	Accumulated Other Comprehensive (Loss)	Non-redeemable Non-controlling Interests in Consolidated Entities	General Partner’s Capital	General Partner’s Capital EQH Exchange Agreement	Limited Partners' Capital	Limited Partners' Capital EQH Exchange Agreement
Partners' capital, beginning balance at Dec. 31, 2023		$ (4,490)	$ (76,363)	$ (106,364)		$ 45,388		$ 4,590,619
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 890,733				$ 1,763	8,735		864,736
Cash distributions to General Partner						(7,101)		(702,324)
Long-term incentive compensation plans activity		797	26,645			83		8,256
Issuance (retirement) of AB Units, net						(460)		(46,314)
Issuance of AB Units in connection with EQH Amended Exchange Agreement							$ 0		$ 0
(Retirement) of AB Units in connection with EQH Amended Exchange Agreement	0					0		0
Capital contributions from AB Holding		201
Purchases of AB Holding Units for long-term compensation plans, net			(73,131)
(Retirement) issuance of AB Units, net			47,378
Re-valuation of AB Holding Units held in rabbi trust			(9,442)
Foreign currency translation adjustment, net of tax	16,878			16,878
Changes in employee benefit related items, net of tax	674			674
Distributions to non-controlling interests, net					(2,696)
Contributions from non-controlling interest					94
Partners' capital, ending balance at Sep. 30, 2024	4,584,401	(3,492)	(84,913)	(88,812)		46,645		4,714,973
Balance, beginning of period at Dec. 31, 2023					4,572
Balance, end of period at Sep. 30, 2024					3,733
Partners' capital, beginning balance at Jun. 30, 2024		(3,822)	(92,612)	(107,436)		45,880		4,639,147
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	351,026				195	3,460		342,512
Cash distributions to General Partner						(2,285)		(226,031)
Long-term incentive compensation plans activity		291	6,266			27		2,759
Issuance (retirement) of AB Units, net						(437)		(43,414)
Issuance of AB Units in connection with EQH Amended Exchange Agreement							0		0
(Retirement) of AB Units in connection with EQH Amended Exchange Agreement						0		0
Capital contributions from AB Holding		39
Purchases of AB Holding Units for long-term compensation plans, net			(39,342)
(Retirement) issuance of AB Units, net			43,751
Re-valuation of AB Holding Units held in rabbi trust			(2,976)
Foreign currency translation adjustment, net of tax	18,514			18,514
Changes in employee benefit related items, net of tax	110			110
Distributions to non-controlling interests, net					(1)
Contributions from non-controlling interest					(1)
Partners' capital, ending balance at Sep. 30, 2024	4,584,401	(3,492)	(84,913)	(88,812)		46,645		4,714,973
Balance, beginning of period at Jun. 30, 2024					3,540
Balance, end of period at Sep. 30, 2024					3,733
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total capital	4,588,134
Total capital	4,874,643
Partners' capital, beginning balance at Dec. 31, 2024	4,873,295	(2,893)	(62,366)	(110,581)		49,519		4,999,616
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	695,374				702	6,906		683,623
Cash distributions to General Partner						(8,471)		(837,724)
Long-term incentive compensation plans activity		1,017	13,934			(13)		(1,327)
Issuance (retirement) of AB Units, net						68		5,426
Issuance of AB Units in connection with EQH Amended Exchange Agreement							8,202		811,986
(Retirement) of AB Units in connection with EQH Amended Exchange Agreement	820,188					(8,202)		(811,986)
Capital contributions from AB Holding		2,088
Purchases of AB Holding Units for long-term compensation plans, net			(47,240)
(Retirement) issuance of AB Units, net			(5,040)
Re-valuation of AB Holding Units held in rabbi trust			61
Foreign currency translation adjustment, net of tax	29,396			29,396
Changes in employee benefit related items, net of tax	23,362			23,362
Distributions to non-controlling interests, net					(592)
Contributions from non-controlling interest					43
Partners' capital, ending balance at Sep. 30, 2025	4,739,361	212	(100,651)	(57,823)		48,009		4,849,614
Balance, beginning of period at Dec. 31, 2024					1,348
Balance, end of period at Sep. 30, 2025					1,501
Partners' capital, beginning balance at Jun. 30, 2025		(2,421)	(94,436)	(50,377)		47,832		4,831,485
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	266,392				169	2,594		256,669
Cash distributions to General Partner						(2,479)		(244,681)
Long-term incentive compensation plans activity		344	3,797			9		851
Issuance (retirement) of AB Units, net						53		5,290
Issuance of AB Units in connection with EQH Amended Exchange Agreement							$ 8,202		$ 811,986
(Retirement) of AB Units in connection with EQH Amended Exchange Agreement						(8,202)		(811,986)
Capital contributions from AB Holding		2,289
Purchases of AB Holding Units for long-term compensation plans, net			(3,594)
(Retirement) issuance of AB Units, net			(5,387)
Re-valuation of AB Holding Units held in rabbi trust			(1,031)
Foreign currency translation adjustment, net of tax	(7,446)			(7,446)
Changes in employee benefit related items, net of tax	0			0
Distributions to non-controlling interests, net					(318)
Contributions from non-controlling interest					15
Partners' capital, ending balance at Sep. 30, 2025	4,739,361	$ 212	$ (100,651)	$ (57,823)		$ 48,009		$ 4,849,614
Balance, beginning of period at Jun. 30, 2025					1,635
Balance, end of period at Sep. 30, 2025					$ 1,501
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total capital	$ 4,740,862