Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Limited Partners interest in Company (as a percent)			99.00%
Net income per unit, basic and diluted [Abstract]
Net income attributable to AB Unitholders	$ 208,769	$ 267,570	$ 469,496	$ 511,701
Weighted average limited partnership units outstanding – basic (in shares)	270,983,000	272,344,000	271,182,000	272,339,000
Dilutive effect of compensatory options to buy AB Holding Units (in shares)	0	12,000	2,000	20,000
Weighted average limited partnership units outstanding – diluted (in shares)	270,983,000	272,356,000	271,184,000	272,359,000
Basic net income per AB Unit (in dollars per share)	$ 0.76	$ 0.97	$ 1.71	$ 1.86
Diluted net income per AB Unit (in dollars per share)	$ 0.76	$ 0.97	$ 1.71	$ 1.86
Anti-dilutive options excluded from diluted net income (in shares)	0	0	0	0
General Partner Interest
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
General partnership interest in Company (percent)			1.00%