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Net Income per Unit (Tables)
 3 Months Ended
Mar. 31, 2024
Earnings Per Unit [Abstract]  
Schedule of Earnings Per Unit, Basic and Diluted
Basic net income per unit is derived by reducing net income for the 1.0% general partnership interest and dividing the remaining 99.0% 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 1.0% general partnership interest and dividing the remaining 99.0% by the total of the diluted weighted average number of limited partnership units outstanding for each period.
 Three Months Ended March 31,
 20242023
(in thousands, except per unit amounts)
Net income attributable to AB Unitholders$217,927 $194,151 
Weighted average limited partnership units outstanding – basic286,876 285,726 
Weighted average limited partnership units outstanding – diluted286,876 285,726 
Basic net income per AB Unit$0.75 $0.67 
Diluted net income per AB Unit$0.75 $0.67