Net Income per Unit (Tables)

3 Months Ended

Mar. 31, 2018

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 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 March 31,
	2018		2017
	(in thousands, except per unit amounts)
Net income attributable to AB Unitholders	$	184,196	$	139,937
Weighted average limited partnership units outstanding – basic	269,184		268,479
Dilutive effect of compensatory options to buy AB Holding Units	336		534
Weighted average limited partnership units outstanding – diluted	269,520		269,013
Basic net income per AB Unit	$	0.68	$	0.52
Diluted net income per AB Unit	$	0.68	$	0.51