Changes in Capital (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Changes in capital [Roll Forward]
Beginning balance	$ 3,803,268
Beginning balance	43,502
Comprehensive income [Abstract]
Net income	113,031	94,542
Other comprehensive income, net of tax [Abstract]
Foreign currency translation adjustment	(10,320)	1,875
Ending balance	42,027
Ending balance	3,928,651
Total Capital [Member]
Changes in capital [Roll Forward]
Beginning balance	3,803,268	4,029,487
Comprehensive income [Abstract]
Net income	113,031	94,542
Other comprehensive income, net of tax [Abstract]
Unrealized gains on investments	359	269
Foreign currency translation adjustment	(10,320)	1,875
Changes in employee benefit related items	190	(82)
Comprehensive income	103,260	96,604
Cash distributions to General Partner and unitholders	(106,182)	(47,490)
Capital contributions (distributions)	750	40
Purchase of AllianceBernstein Units	(7)	(221)
Compensation-related transactions	127,562	69,562
Ending balance	3,928,651	4,147,982
Partners Capital Attributable to AllianceBernstein Unitholders [Member]
Changes in capital [Roll Forward]
Beginning balance	3,759,766	3,975,462
Comprehensive income [Abstract]
Net income	114,516	87,278
Other comprehensive income, net of tax [Abstract]
Unrealized gains on investments	359	269
Foreign currency translation adjustment	(10,330)	1,823
Changes in employee benefit related items	190	(82)
Comprehensive income	104,735	89,288
Cash distributions to General Partner and unitholders	(106,182)	(47,490)
Capital contributions (distributions)	750	889
Purchase of AllianceBernstein Units	(7)	(221)
Compensation-related transactions	127,562	69,562
Ending balance	3,886,624	4,087,490
Non-controlling Interests in Consolidated Entities [Member]
Changes in capital [Roll Forward]
Beginning balance	43,502	54,025
Comprehensive income [Abstract]
Net income	(1,485)	7,264
Other comprehensive income, net of tax [Abstract]
Unrealized gains on investments	0	0
Foreign currency translation adjustment	10	52
Changes in employee benefit related items	0	0
Comprehensive income	(1,475)	7,316
Cash distributions to General Partner and unitholders	0	0
Capital contributions (distributions)	0	(849)
Purchase of AllianceBernstein Units	0	0
Compensation-related transactions	0	0
Ending balance	$ 42,027	$ 60,492

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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