Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 382,678	$ 417,680
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	16,921	18,336
Non-cash long-term incentive compensation expense	15,367	27,116
Depreciation and other amortization	45,928	22,479
Unrealized losses (gains) on investments	(1,853)	42,767
Non-cash lease expense	51,768	52,008
Other, net	4,699	13,481
Changes in assets and liabilities:
Decrease (increase) in securities, segregated	643,417	(242,981)
Decrease (increase) in receivables	336,744	(236,763)
Decrease (increase) in investments	3,155	12,527
(Increase) in deferred sales commissions	(29,916)	(3,093)
(Increase) in other assets	(18,581)	(92,696)
(Decrease) increase in payables	(1,027,887)	396,196
(Decrease) increase in accounts payable and accrued expenses	(15,595)	15,873
Increase in accrued compensation and benefits	185,443	200,725
Cash payments to relieve operating lease liabilities	(53,498)	(54,148)
Net cash provided by operating activities	722,321	701,987
Cash flows from investing activities:
Purchases of furniture, equipment and leasehold improvements	(14,941)	(19,337)
Capital contributions (to) affiliates	2,030	0
Acquisition of business, net cash acquired	0	(495)
Net cash used in investing activities	(16,971)	(19,832)
Cash flows from financing activities:
Repayment of debt, net	(120,000)
Proceeds from debt, net		45,000
(Decrease) in overdrafts payable	0	(14,235)
Distributions to General Partner and Unitholders	(435,213)	(648,224)
Capital contributions from affiliates	0	373
Additional investments by AB Holding with proceeds from exercise of compensatory options to buy AB Holding Units	0	178
Purchases of AB Holding Units to fund long-term incentive compensation plan awards, net	(18,662)	(106,457)
Other, net	(2,426)	(1,352)
Net cash used in financing activities	(772,184)	(785,117)
Effect of exchange rate changes on cash and cash equivalents	16,178	(51,772)
Net (decrease) in cash and cash equivalents	(50,656)	(154,734)
Cash and cash equivalents as of beginning of the period	1,309,017	1,376,026
Cash and cash equivalents as of end of the period	1,258,361	1,221,292
Non-cash investing activities:
Fair value of assets acquired (less cash acquired of zero in 2022)	0	2,995
Non-cash financing activities:
Contingent consideration liability	0	2,500
Company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized losses (gains) on investments	(27,027)	80,091
Changes in assets and liabilities:
Decrease (increase) in investments	221,636	74,429
(Decrease) in other assets and liabilities of consolidated company-sponsored investment funds, net	(11,078)	(42,040)
Cash flows from financing activities:
(Redemptions) of non-controlling interest in consolidated company-sponsored investment funds, net	$ (195,883)	$ (60,400)