Income Taxes (Tables)

6 Months Ended

Jun. 30, 2020

Income Tax Disclosure [Abstract]

Computation of Effective Income Tax Rate and Changes in Components of Income Tax

	Three Months Ended June 30,								Six Months Ended June 30,
	2020			2019			% Change		2020			2019			% Change
									(in thousands)
Net income attributable to AB Unitholders	$	177,321		$	166,252		6.7	%	$	371,641		$	315,366		17.8	%
Multiplied by: weighted average equity ownership interest	35.6		%	35.5		%			35.8		%	35.4		%
Equity in net income attributable to AB Unitholders	$	63,201		$	59,023		7.1		$	133,115		$	111,661		19.2
AB qualifying revenues	$	586,609		$	643,019		(8.8	)	$	1,288,949		$	1,229,569		4.8
Multiplied by: weighted average equity ownership interest for calculating tax	29.9		%	29.4		%			30.4		%	29.5		%
Multiplied by: federal tax	3.5		%	3.5		%			3.5		%	3.5		%
Federal income taxes	6,179			6,619					13,694			12,700
State income taxes	96			130					236			248
Total income taxes	$	6,275		$	6,749		(7.0	)	$	13,930		$	12,948		7.6
Effective tax rate	9.9		%	11.4		%			10.5		%	11.6		%