Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 1,193,485	$ 788,619	$ 775,457
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	57,983	36,817	34,762
Non-cash long-term incentive compensation expense	217,220	180,451	199,390
Depreciation and other amortization	91,126	92,113	66,617
Non-cash lease expense	112,458	101,761	99,861
(Gain) on divestiture	(134,555)	0	0
(Gain) loss on assets held for sale	0	(800)	7,400
Remeasurement of contingent payment arrangements	(130,901)	14,050	0
Retirement plan loss	14,309	0	0
Other, net	28,424	(4,641)	14,604
Changes in assets and liabilities:
Decrease (increase) in securities, segregated	367,634	654,751	(18,474)
(Increase) decrease in receivables	(199,288)	629,204	35,410
(Increase) in deferred sales commissions	(153,316)	(71,941)	(12,113)
(Decrease) in other liabilities of consolidated company-sponsored investment funds, net	(10,821)	(42,992)	(31,471)
(Decrease) increase in payables	(388,594)	(1,451,280)	110,112
Increase (decrease) in accounts payable and accrued expenses	86,999	(6,992)	(8,424)
Increase (decrease) in accrued compensation and benefits	26,113	(22,848)	(150,285)
Cash payments to relieve operating lease liabilities	(90,190)	(107,738)	(109,182)
Net cash provided by operating activities	1,406,304	872,292	1,121,231
Cash flows from investing activities:
Purchases of furniture, equipment and leasehold improvements	(122,330)	(33,627)	(62,308)
Divestiture of business (includes $304.0 million in cash proceeds)	(40,196)	0	0
Capital contributions to equity method investments	(39,401)	0	0
Debt repayments from equity method investments	86,200	0	0
Acquisition of businesses, net of cash acquired	0	0	40,282
Net cash used in investing activities	(115,727)	(33,627)	(22,026)
Cash flows from financing activities:
Repayment of debt, net	(444,316)
Proceeds from debt, net		164,316	235,000
(Decrease) increase in overdrafts payable	(11)	0	(25,411)
Distributions to General Partner and Unitholders	(954,464)	(839,271)	(1,069,820)
Capital contributions (to) from AB Holding	(770)	(2,164)	1,590
Additional investments by AB Holding with proceeds from exercise of compensatory options to buy AB Holding Units	0	0	178
Purchases of AB Holding Units to fund long-term incentive compensation plan awards, net	(157,038)	(144,086)	(210,568)
Proceeds from issuance of private units to EQH	150,000	0	0
Payment of acquisition-related debt obligation	0	0	(42,661)
Other, net	(9,362)	(4,870)	(2,131)
Net cash used in financing activities	(1,597,130)	(1,009,320)	(1,109,980)
Effect of exchange rate changes on cash and cash equivalents	(20,303)	22,527	(56,234)
Net (decrease) in cash and cash equivalents	(326,856)	(148,128)	(67,009)
Cash and cash equivalents as of beginning of the period	1,160,889	1,309,017	1,376,026
Cash and cash equivalents as of end of the period	834,033	1,160,889	1,309,017
Cash paid:
Interest paid	125,839	155,335	78,434
Income taxes paid	51,799	57,216	55,473
Non-cash investing activities:
Fair value of assets acquired (excluding cash acquired of zero , zero and $40.8 million, for 2024, 2023 and 2022, respectively)	0	0	1,085,141
Fair value of deferred tax asset recorded	0	0	5,072
Fair value of liabilities assumed	0	0	296,750
Fair value of non-redeemable non-controlling interest recorded	0	0	13,191
Non-cash financing activities:
Payables recorded under contingent payment arrangements	0	0	231,385
Equity consideration issued in connection with acquisition	0	0	589,169
Retirement of AB Units for EQH Exchange Agreement	(185,101)	0	0
Issuance of AB Units for EQH Exchange Agreement	185,101	0	0
Excluding company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized (gains) losses on investments	(5,503)	(7,810)	40,857
Equity in earnings of equity method investments	36,551	0	0
Changes in assets and liabilities:
Decrease (Increase) in investments	7,238	(10,656)	(10,331)
Decrease (increase) in other assets	13,052	(36,263)	(5,487)
Company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized (gains) losses on investments	(15,898)	(48,350)	73,194
Changes in assets and liabilities:
Decrease (Increase) in investments	272,280	167,712	23,295
Decrease (Increase) in other assets of consolidated company-sponsored investment funds	10,498	19,125	(13,961)
Cash flows from financing activities:
(Redemptions) subscriptions of non-controlling interests of consolidated company-sponsored investment funds, net	$ (181,169)	$ (183,245)	$ 3,843