Net Income Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Percentage of Limited Partners interest in Company	99.00%
Net income per unit, basic and diluted [Abstract]
Net income attributable to AB Unitholders	$ 1,148,623	$ 865,952	$ 752,042
Weighted average units outstanding—basic (in units)	271,729,000	269,058,000	268,075,000
Dilutive effect of compensatory options to buy AB Holding Units (in units)	11,000	27,000	44,000
Weighted average units outstanding - diluted (in units)	271,740,000	269,085,000	268,119,000
Basic net income per AB Unit (in dollars per unit)	$ 4.18	$ 3.19	$ 2.78
Diluted net income per AB Unit (in dollars per unit)	$ 4.18	$ 3.19	$ 2.78
Anti-dilutive options excluded from diluted net income (in units)	0	29,056	29,056
AB Holding | AllianceBernstein Corporation
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Percentage of General Partnership interest in company	1.00%