Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 66,999	$ 59,828	$ 186,184	$ 158,541
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in net income attributable to AB Unitholders	(73,874)	(66,722)	(206,989)	(178,383)
Cash distributions received from AB			225,802	182,475
Changes in assets and liabilities:
(Increase) in other assets			(60)	(61)
(Decrease) increase in other liabilities			(1,334)	93
Net cash provided by operating activities			203,603	162,665
Cash flows from investing activities:
Investments in AB with proceeds from exercise of compensatory options to buy AB Holding Units			(147)	(9,642)
Net cash used in investing activities			(147)	(9,642)
Cash flows from financing activities:
Cash distributions to Unitholders			(204,468)	(162,195)
Capital contributions from (to) AB			865
Capital contributions from (to) AB				(470)
Proceeds from exercise of compensatory options to buy AB Holding Units			147	9,642
Net cash used in financing activities			(203,456)	(153,023)
Change in cash and cash equivalents			0	0
Cash and cash equivalents as of beginning of period			0	0
Cash and cash equivalents as of end of period	$ 0	$ 0	$ 0	$ 0