Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 775,457	$ 1,153,734	$ 861,783
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	34,762	34,364	27,355
Non-cash long-term incentive compensation expense	199,390	216,425	195,642
Depreciation and other amortization	66,617	44,985	61,028
Unrealized losses on investments	40,857	4,454	10,405
Non-cash lease expense	99,861	98,773	98,798
Adjustments to Assets Held-For-Sale	7,400	0	0
Other, net	14,604	22,580	(2,914)
Changes in assets and liabilities:
(Increase) decrease in securities, segregated	(18,474)	249,521	(658,612)
Decrease (increase) in receivables	35,410	(360,789)	(182,684)
(Increase) decrease in investments	(10,331)	(27,000)	7,597
(Increase) in deferred sales commissions	(12,113)	(45,197)	(55,125)
(Increase) decrease in other assets	(5,487)	(6,578)	69,160
Increase in payables	110,112	214,139	861,502
(Decrease) increase in accounts payable and accrued expenses	(8,424)	35,877	10,666
(Decrease) increase in accrued compensation and benefits	(150,285)	50,545	46,885
Cash payments to relieve operating lease liabilities	(109,182)	(114,769)	(115,656)
Net cash provided by operating activities	1,121,231	1,298,782	1,521,421
Cash flows from investing activities:
Purchases of equity method investments	0	0	(4,079)
Purchases of furniture, equipment and leasehold improvements	(62,308)	(61,931)	(41,504)
Acquisition of businesses, net of cash acquired	40,282	(3,793)	(13,552)
Net cash used in investing activities	(22,026)	(65,724)	(59,135)
Cash flows from financing activities:
Proceeds from debt, net	235,000	80,000	115,000
(Decrease) increase in overdrafts payable	(25,411)	16,192	(12,633)
Distributions to General Partner and Unitholders	(1,069,820)	(1,059,892)	(836,879)
Proceeds from (Payments For) Contributions from (Distributions To) Affiliates	1,590	(2,346)	(867)
Additional investments by AB Holding with proceeds from exercise of compensatory options to buy AB Holding Units	178	3,402	147
Purchases of AB Holding Units to fund long-term incentive compensation plan awards, net	(210,568)	(261,825)	(148,624)
Payment of acquisition-related debt obligation	(42,661)	0	0
Other, net	(2,131)	(2,186)	306
Net cash used in financing activities	(1,109,980)	(912,956)	(1,102,583)
Effect of exchange rate changes on cash and cash equivalents	(56,234)	(17,982)	23,032
Net (decrease) increase in cash and cash equivalents	(67,009)	302,120	382,735
Cash and cash equivalents as of beginning of the period	1,376,026	1,073,906	691,171
Cash and cash equivalents as of end of the period	1,309,017	1,376,026	1,073,906
Cash paid:
Interest paid	78,434	5,263	18,858
Income taxes paid	55,473	55,656	59,791
Non-cash investing activities:
Fair value of assets acquired (excluding cash acquired of $40.8 million, $2.8 million and $0.6 million, for 2022, 2021 and 2020, respectively)	1,085,141	13,235	18,389
Fair value of deferred tax asset recorded	5,072	0	0
Fair value of liabilities assumed	296,750	1,642	437
Fair value of non-redeemable non-controlling interest recorded	13,191	0	0
Non-cash financing activities:
Payables recorded under contingent payment arrangements	231,385	7,800	4,400
Equity consideration issued in connection with acquisition	589,169	0	0
Consolidated company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized losses on investments	73,194	1,882	(854)
Changes in assets and liabilities:
(Increase) decrease in investments	23,295	(312,325)	279,276
(Increase) decrease in other assets	(45,432)	38,161	7,169
Cash flows from financing activities:
Subscriptions (redemptions) of non-controlling interests of consolidated company-sponsored investment funds, net	$ 3,843	$ 313,699	$ (219,033)