Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 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	$ 260,727	$ 244,131
Weighted average limited partnership units outstanding – basic (in shares)	271,383,000	272,332,000
Dilutive effect of compensatory options to buy AB Holding Units (in shares)	3,000	32,000
Weighted average limited partnership units outstanding – diluted (in shares)	271,386,000	272,364,000
Basic net income per AB Unit (in dollars per share)	$ 0.95	$ 0.89
Diluted net income per AB Unit (in dollars per share)	$ 0.95	$ 0.89
Anti-dilutive options excluded from diluted net income (in shares)	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%