Net Income per Unit (Tables)

9 Months Ended

Sep. 30, 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 September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(in thousands, except per unit amounts)
Net income attributable to AB Unitholders	$	203,674	$	140,954	$	569,535	$	415,994
Weighted average limited partnership units outstanding – basic	269,603		265,585		269,783		267,448
Dilutive effect of compensatory options to buy AB Holding Units	245		400		282		455
Weighted average limited partnership units outstanding – diluted	269,848		265,985		270,065		267,903
Basic net income per AB Unit	$	0.75	$	0.53	$	2.09	$	1.54
Diluted net income per AB Unit	$	0.75	$	0.52	$	2.09	$	1.54