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Net Income per Unit (Tables)
 3 Months Ended
Mar. 31, 2017
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% general partnership interest and dividing the remaining 99% by the basic weighted average number of 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 units outstanding for each period.
 
 
Three Months Ended March 31,
 
 
2017
 
2016
 
(in thousands, except per unit amounts)
 
 
 
 
 
Net income attributable to AB Unitholders
 
$
139,937

 
$
166,284

 
 
 
 
 
Weighted average units outstanding – basic
 
268,479

 
271,853

Dilutive effect of compensatory options to buy AB Holding Units
 
534

 
400

Weighted average units outstanding – diluted
 
269,013

 
272,253

Basic net income per AB Unit
 
$
0.52

 
$
0.61

Diluted net income per AB Unit
 
$
0.51

 
$
0.60