Net Income Per Unit (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Unit, Basic and Diluted

Basic net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the basic weighted average number of limited partnership units outstanding for each year. Diluted net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the total of the diluted weighted average number of limited partnership units outstanding for each year.

	Year Ended December 31,
	2020		2019		2018
	(in thousands, except per unit amounts)
Net income attributable to AB Unitholders	$	865,952	$	752,042	$	757,588
Weighted average units outstanding—basic	269,058		268,075		269,236
Dilutive effect of compensatory options to buy AB Holding Units	27		44		251
Weighted average units outstanding—diluted	269,085		268,119		269,487
Basic net income per AB Unit	$	3.19	$	2.78	$	2.79
Diluted net income per AB Unit	$	3.19	$	2.78	$	2.78