Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Cash flows from operating activities:
Net income	$ 581,006	$ 428,982
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	42,651	41,311
Non-cash long-term incentive compensation expense	22,647	10,809
Depreciation and other amortization	44,394	43,003
Non-cash lease expense	36,875	35,085
Retirement plan loss	0	20,756
Retirement plan funding	0	(1,700)
Other, net	6,026	3,663
Changes in assets and liabilities:
Decrease in securities, segregated	270,532	16,808
(Increase) decrease in receivables	(117,042)	69,369
(Increase) in deferred sales commissions	(19,851)	(35,214)
Increase in other liabilities of consolidated company-sponsored investment funds	3,229	35,217
Increase (decrease) in payables	52,054	(36,650)
(Decrease) in accounts payable and accrued expenses	(104,664)	(11,975)
Increase in accrued compensation and benefits	225,881	187,325
Cash payments to relieve operating lease liabilities	(33,661)	(32,682)
Net cash provided by operating activities	950,096	489,815
Cash flows from investing activities:
Purchases of furniture, equipment and leasehold improvements	(21,010)	(18,157)
Net cash (used in) investing activities	(21,010)	(18,157)
Cash flows from financing activities:
(Repayment of) debt, net	(230,000)	(60,000)
Distributions to General Partner and Unitholders	(579,190)	(599,035)
Capital contributions (to) AB Holding	(1,523)	(1,307)
Purchases of AB Holding Units for long-term incentive compensation plan awards, net	(27,751)	(43,646)
Other, net	(1,283)	(3,318)
Net cash (used in) financing activities	(818,203)	(491,720)
Effect of exchange rate changes on cash and cash equivalents	(5,133)	40,776
Net increase in cash and cash equivalents	105,750	20,714
Cash and cash equivalents as of beginning of the period	796,573	834,033
Cash and cash equivalents as of end of the period	902,323	854,747
Excluding Company-Sponsored Investment Funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized (gains) on investments	(4,277)	(3,823)
(Gains) losses on equity method investments	(43,962)	16,652
Changes in assets and liabilities:
Decrease (increase) in investments	146,520	2,156
(Increase) decrease in other assets	(53,158)	14,872
Company-Sponsored Investment Funds
Changes in assets and liabilities:
Decrease (increase) in investments	(100,606)	(302,058)
(Increase) in other assets of consolidated company-sponsored investment funds	(4,498)	(12,091)
Cash flows from financing activities:
Third-party capital invested into consolidated company-sponsored investment funds, net	$ 21,544	$ 215,586