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Net Income per Unit
 9 Months Ended
Sep. 30, 2020
Earnings Per Unit [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 period. 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 period.
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
(in thousands, except per unit amounts)
Net income attributable to AB Unitholders$207,976 $187,811 $579,617 $503,177 
Weighted average limited partnership units outstanding – basic268,538 268,567 269,369 268,131 
Dilutive effect of compensatory options to buy AB Holding Units27 36 23 52 
Weighted average limited partnership units outstanding – diluted268,565 268,603 269,392 268,183 
Basic net income per AB Unit$0.77 $0.69 $2.13 $1.86 
Diluted net income per AB Unit$0.77 $0.69 $2.13 $1.86 
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
(amounts as shown)
Anti-dilutive options excluded from diluted net income29,056 29,056 29,056 29,056