Income Taxes (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

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

		Three Months Ended March 31,
		2019			2018			% Change
	(in thousands)
Net income attributable to AB Unitholders		$	149,114		$	184,196		(19.0	)%
Multiplied by: weighted average equity ownership interest		35.3		%	35.7		%
Equity in net income attributable to AB Unitholders		$	52,638		$	65,698		(19.9	)
AB qualifying revenues		$	586,550		$	702,919		(16.6	)
Multiplied by: weighted average equity ownership interest for calculating tax		29.6		%	30.1		%
Multiplied by: federal tax		3.5		%	3.5		%
Federal income taxes		6,081			7,410
State income taxes		118			128
Total income taxes		$	6,199		$	7,538		(17.8	)
Effective tax rate		11.8		%	11.5		%