Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 417,680	$ 514,982
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	18,336	16,135
Non-cash long-term incentive compensation expense	27,116	27,666
Depreciation and other amortization	22,479	22,061
Unrealized losses (gains) on investments	42,767	4,269
Non-cash lease expense	52,008	48,048
Other, net	13,481	11,699
Changes in assets and liabilities:
(Increase) decrease in securities, segregated	(242,981)	680,396
(Increase) in receivables	(236,763)	(222,721)
Decrease (increase) in investments	12,527	19,963
(Increase) in deferred sales commissions	(3,093)	(20,483)
(Increase) in other assets	(92,696)	(80,455)
Increase (decrease) in payables	396,196	(513,344)
Increase in accounts payable and accrued expenses	15,873	13,617
Increase in accrued compensation and benefits	200,725	265,557
Cash payments to relieve operating lease liabilities	(54,148)	(57,388)
Net cash provided by operating activities	701,987	850,297
Cash flows from investing activities:
Purchases of furniture, equipment and leasehold improvements	(19,337)	(25,914)
Acquisition of business, net of cash acquired	(495)	(3,793)
Net cash used in investing activities	(19,832)	(29,707)
Cash flows from financing activities:
Borrowings (repayments) of debt, net	45,000	(85,000)
(Decrease) increase in overdrafts payable	(14,235)	8,315
Distributions to General Partner and Unitholders	(648,224)	(531,810)
Capital contributions to (from) affiliates	373	(408)
Additional investments by AB Holding with proceeds from exercise of compensatory options to buy AB Holding Units	178	3,402
Purchases of AB Holding Units to fund long-term incentive compensation plan awards, net	(106,457)	(75,468)
Other	(1,352)	(914)
Net cash used in financing activities	(785,117)	(769,720)
Effect of exchange rate changes on cash and cash equivalents	(51,772)	(1,223)
Net (decrease) increase in cash and cash equivalents	(154,734)	49,647
Cash and cash equivalents as of beginning of the period	1,376,026	1,073,906
Cash and cash equivalents as of end of the period	1,221,292	1,123,553
Non-cash investing activities:
Fair value of assets acquired (less cash acquired of zero and $2.8 million, respectively)	2,995	13,235
Fair value of liabilities assumed	0	1,642
Non-cash financing activities:
Payables recorded under contingent payment arrangements	2,500	7,800
Company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized losses (gains) on investments	80,091	(936)
Changes in assets and liabilities:
Decrease (increase) in investments	74,429	136,578
(Decrease) in other assets and liabilities of consolidated company-sponsored investment funds, net	(42,040)	(15,347)
Cash flows from financing activities:
(Redemptions) of non-controlling interest in consolidated company-sponsored investment funds, net	$ (60,400)	$ (87,837)