Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 168,749	$ 159,230
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	5,526	3,502
Non-cash long-term incentive compensation expense	7,591	19,070
Depreciation and other amortization	36,156	41,892
Unrealized losses (gains) on investments	20,585	(10,543)
Other, net	(1,324)	6,246
Changes in assets and liabilities:
(Increase) in securities, segregated	(917,696)	(92,624)
(Increase) decrease in receivables	(615,055)	97,411
(Increase) decrease in investments	(17,557)	449,556
(Increase) in deferred sales commissions	(18,510)	(3,175)
Decrease (increase) in right-of-use assets	134	(1,000)
(Increase) decrease in other assets	(118,038)	38,685
Increase (decrease) in payables	1,492,200	(222,472)
(Decrease) in lease liabilities	(23,968)	(34,914)
Increase (decrease) in accounts payable and accrued expenses	5,456	(29,114)
Increase in accrued compensation and benefits	70,792	40,644
Net cash provided by operating activities	286,703	432,469
Cash flows from investing activities:
Purchases of furniture, equipment and leasehold improvements	(3,321)	(5,567)
Acquisition of business, net of cash acquired	(11,473)	0
Net cash used in investing activities	(14,794)	(5,567)
Cash flows from financing activities:
Issuance of commercial paper, net	104,814	15,459
Proceeds of EQH Facility	270,000	0
(Repayment) of bank loans	0	(25,000)
Increase (decrease) in overdrafts payable	85,395	(65,352)
Distributions to General Partner and Unitholders	(253,803)	(191,485)
Capital contributions (to) affiliates	(699)	(932)
Additional investments by AB Holding with proceeds from exercise of compensatory options to buy AB Holding Units	147	7,382
Purchases of AB Holding Units to fund long-term incentive compensation plan awards, net	(17,750)	(58,452)
Other	(504)	(228)
Net cash provided by (used in) financing activities	112,509	(318,644)
Effect of exchange rate changes on cash and cash equivalents	(13,049)	640
Net increase (decrease) in cash and cash equivalents	371,369	108,898
Cash and cash equivalents as of beginning of the period	691,171	653,324
Cash and cash equivalents as of end of the period	1,062,540	762,222
Company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized losses (gains) on investments	52,115	(21,930)
Changes in assets and liabilities:
(Increase) decrease in investments	85,418	(11,683)
(Increase) decrease in other assets	54,129	3,688
Cash flows from financing activities:
(Redemptions) of non-controlling interest in consolidated company-sponsored investment funds, net	$ (75,091)	$ (36)