Business Description, Organization and Basis of Presentation (Revision) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equity in net income attributable to AB Unitholders	$ 47,947	$ 44,657	$ 97,613	$ 104,834
Net income	$ 41,741	$ 39,072	$ 85,651	$ 93,664
Basic net income per unit (in dollars per unit)	$ 0.43	$ 0.40	$ 0.89	$ 0.95
Diluted net income per unit (in dollars per unit)	$ 0.43	$ 0.40	$ 0.89	$ 0.95
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equity in net income attributable to AB Unitholders		$ 45,489		$ 106,621
Net income		$ 39,904		$ 95,451
Basic net income per unit (in dollars per unit)		$ 0.41		$ 0.97
Diluted net income per unit (in dollars per unit)		$ 0.41		$ 0.97
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equity in net income attributable to AB Unitholders		$ (832)		$ (1,787)
Net income		$ (832)		$ (1,787)
Basic net income per unit (in dollars per unit)		$ (0.01)		$ (0.02)
Diluted net income per unit (in dollars per unit)		$ (0.01)		$ (0.02)