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Net Income per Unit
 9 Months Ended
Sep. 30, 2025
Earnings Per Unit [Abstract]  
Net Income per Unit Net Income per Unit
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 September 30,Nine Months Ended September 30,
 2025202420252024
(in thousands, except per unit amounts)
Net income attributable to AB Unitholders$259,263 $345,972 $690,529 $873,471 
Weighted average limited partnership Units outstanding 292,116 286,196 292,122 286,752 
Net income per AB Unit$0.88 $1.20 $2.34 $3.02