Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 988,875	$ 1,193,485	$ 788,619
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	83,514	57,983	36,817
Non-cash long-term incentive compensation expense	211,475	217,220	180,451
Depreciation and other amortization	87,102	91,126	92,113
Non-cash lease expense	71,375	112,458	101,761
(Gain) on divestiture	0	(134,555)	0
(Gain) on assets held for sale	0	0	(800)
Remeasurement of contingent payment arrangements	0	(130,901)	14,050
Retirement plan loss	17,733	14,309	0
Other, net	10,484	28,424	(4,641)
Changes in assets and liabilities:
Decrease in securities, segregated	983	367,634	654,751
(Increase) decrease in receivables	(90,983)	(199,288)	629,204
(Increase) in deferred sales commissions	(66,108)	(153,316)	(71,941)
Increase (decrease) in other liabilities of consolidated company-sponsored investment funds	23,565	(10,821)	(42,992)
Increase (decrease) in payables	46,015	(388,594)	(1,451,280)
(Decrease) increase in accounts payable and accrued expenses	(51,852)	86,999	(6,992)
(Decrease) increase in accrued compensation and benefits	(26,693)	26,113	(22,848)
Cash payments to relieve operating lease liabilities	(66,262)	(90,190)	(107,738)
Net cash provided by operating activities	1,032,855	1,406,304	872,292
Cash flows from investing activities:
Purchases of furniture, equipment and leasehold improvements	(38,757)	(122,330)	(33,627)
Divestiture of business (includes $304.0 million in cash proceeds in 2024)	0	(40,196)	0
Capital contribution to equity method investments	0	(39,401)	0
Debt repayment from equity method investments	0	86,200	0
Net cash used in investing activities	(38,757)	(115,727)	(33,627)
Cash flows from financing activities:
Proceeds from debt, net	100,000		164,316
Repayment of debt, net		(444,316)
(Decrease) in overdrafts payable	0	(11)	0
Distributions to General Partner and Unitholders	(1,123,911)	(954,464)	(839,271)
Capital contributions (to) AB Holding	(83)	(770)	(2,164)
Purchases of AB Holding Units for long-term incentive compensation plan awards, net	(161,708)	(157,038)	(144,086)
Proceeds from issuance of private units to EQH	0	150,000	0
Other, net	(5,459)	(9,362)	(4,870)
Net cash used in financing activities	(1,067,069)	(1,597,130)	(1,009,320)
Effect of exchange rate changes on cash and cash equivalents	35,511	(20,303)	22,527
Net (decrease) in cash and cash equivalents	(37,460)	(326,856)	(148,128)
Cash and cash equivalents as of beginning of the period	834,033	1,160,889	1,309,017
Cash and cash equivalents as of end of the period	796,573	834,033	1,160,889
Cash paid:
Interest paid	88,483	125,839	155,335
Income taxes paid	68,675	51,799	57,216
EQH Amended Exchange Agreement
Non-cash financing activities:
Retirement of AB Holding Units in connection with the EQH Exchange and Amended Exchange Agreement	(820,188)	(185,101)	0
Issuance of AB Holding Units in connection with the EQH Exchange and Amended Exchange Agreement	820,188	185,101	0
Excluding company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized (gains) on investments	(10,998)	(5,503)	(7,810)
Equity losses of equity method investments	31,689	36,551	0
Changes in assets and liabilities:
(Increase) decrease in investments	(16,006)	7,238	(10,656)
(Increase) decrease in other assets	(10,992)	13,052	(36,263)
Company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized (gains) on investments	(3,291)	(15,898)	(48,350)
Changes in assets and liabilities:
(Increase) decrease in investments	(186,451)	272,280	167,712
(Increase) decrease in other assets of consolidated company-sponsored investment funds	(10,319)	10,498	19,125
Cash flows from financing activities:
Subscriptions of non-controlling interests of consolidated company-sponsored investment funds, net	$ 124,092
Redemptions of non-controlling interests of consolidated company-sponsored investment funds, net		$ (181,169)	$ (183,245)