Net Income per Unit (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in thousands, except per unit amounts)
Net income attributable to AB Unitholders	$	181,665	$	135,103	$	365,861	$	275,040
Weighted average limited partnership units outstanding – basic	270,564		268,302		269,870		268,391
Dilutive effect of compensatory options to buy AB Holding Units	272		430		303		482
Weighted average limited partnership units outstanding – diluted	270,836		268,732		270,173		268,873
Basic net income per AB Unit	$	0.66	$	0.50	$	1.34	$	1.01
Diluted net income per AB Unit	$	0.66	$	0.50	$	1.34	$	1.01