Net Income per Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Limited partners interest in company (percent)	99.00%
Net income per unit, basic and diluted [Abstract]
Net income attributable to AB Unitholders	$ 220,799	$ 217,927
Weighted average limited partnership Units outstanding – basic (in shares)	292,187	286,876
Weighted average limited partnership Units outstanding – diluted (in shares)	292,187	286,876
Basic net income per AB Unit (in dollars per share)	$ 0.75	$ 0.75
Diluted net income per AB Unit (in dollars per share)	$ 0.75	$ 0.75
AB Holding | AB
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
General partnership interest in company (percent)	1.00%