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Net Income per Unit (Tables)
 3 Months Ended
Mar. 31, 2025
Earnings Per Unit [Abstract]  
Schedule of Earnings Per Unit, Basic and 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 weighted average number of limited partnership units outstanding for each period. Diluted net income per Unit is equivalent to net income per Unit, as there are no outstanding instruments that have a dilutive effect.
 Three Months Ended March 31,
 20252024
(in thousands, except per unit amounts)
Net income attributable to AB Unitholders$220,799 $217,927 
Weighted average limited partnership Units outstanding 292,187 286,876 
Net income per AB Unit$0.75 $0.75