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Net Income Per Unit
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Net Income Per Unit Net Income Per Unit
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.
Years Ended December 31
202120202019
(in thousands, except per unit amounts)
Net income attributable to AB Unitholders$1,148,623 $865,952 $752,042 
Weighted average units outstanding—basic271,729 269,058 268,075 
Dilutive effect of compensatory options to buy AB Holding Units11 27 44 
Weighted average units outstanding—diluted271,740 269,085 268,119 
Basic net income per AB Unit$4.18 $3.19 $2.78 
Diluted net income per AB Unit$4.18 $3.19 $2.78 
Years Ended December 31
202120202019
Anti-dilutive options excluded from diluted net income— 29,056 29,056