Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 235,682	$ 243,839
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	9,383	7,899
Non-cash long-term incentive compensation expense	18,616	18,144
Depreciation and other amortization	11,124	10,967
Unrealized losses on investments	21,024	(175)
Operating Lease, Expense	26,557	23,907
Other, net	4,395	10,977
Changes in assets and liabilities:
(Increase) decrease in securities, segregated	(188,669)	340,605
(Increase) in receivables	(193,178)	(117,622)
Decrease (increase) in investments	8,434	53,493
(Increase) in deferred sales commissions	(3,562)	(10,952)
Increase (decrease) in other assets	(111,939)	(68,957)
Increase (decrease) in payables	199,166	(218,887)
Increase (decrease) in accounts payable and accrued expenses	20,473	(1,566)
Increase in accrued compensation and benefits	43,766	66,909
Cash payments to relieve operating lease liabilities	(26,828)	(28,007)
Net cash provided by operating activities	150,183	328,795
Cash flows from investing activities:
Purchases of furniture, equipment and leasehold improvements	(6,237)	(15,584)
Acquisition of business, net of cash acquired	0	(3,795)
Net cash used in investing activities	(6,237)	(19,379)
Cash flows from financing activities:
Borrowings (repayments) of debt, net	95,000	(50,000)
(Decrease) in overdrafts payable	(14,736)	(1,190)
Distributions to General Partner and Unitholders	(377,810)	(289,711)
Capital contributions (from) to affiliates	(529)	6,096
Additional investments by AB Holding with proceeds from exercise of compensatory options to buy AB Holding Units	0	1,914
Purchases of AB Holding Units to fund long-term incentive compensation plan awards, net	(13,822)	(35,854)
Other	(1,173)	(475)
Net cash used in financing activities	(371,173)	(382,720)
Effect of exchange rate changes on cash and cash equivalents	(11,431)	(1,589)
Net decrease in cash and cash equivalents	(238,658)	(74,893)
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	1,137,368	999,013
Non-cash investing activities:
Fair value of assets acquired (less cash acquired of $2.8 million in the first quarter of 2021)	0	12,962
Fair value of liabilities assumed	0	1,642
Non-cash financing activities:
Payables recorded under contingent payment arrangements	0	7,525
Company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized losses on investments	40,898	6,941
Changes in assets and liabilities:
Decrease (increase) in investments	85,201	(12,401)
Increase (decrease) in other assets	(50,360)	3,681
Cash flows from financing activities:
(Redemptions) of non-controlling interest in consolidated company-sponsored investment funds, net	$ (58,103)	$ (13,500)