Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
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	$ 217,927	$ 194,151
Weighted average limited partnership units outstanding – basic (in shares)	286,876,000	285,726,000
Weighted average limited partnership units outstanding – diluted (in shares)	286,876,000	285,726,000
Basic net income per AB Unit (in dollars per share)	$ 0.75	$ 0.67
Diluted net income per AB Unit (in dollars per share)	$ 0.75	$ 0.67
Anti-dilutive options excluded from diluted net income (in shares)	0	0
AB Holding | AB
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
General partnership interest in company (percent)	1.00%