Non-Controlling Redeemable Interests in Consolidated Funds (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Summary of changes in the non-controlling redeemable interests in the consolidated funds:
Beginning balance	$ 41,048,607	$ 44,466,116
Contributions	3,281,270	3,249,993
Distributions	(5,842,026)	(7,808,663)
Net income	2,798,445	2,106,319
Change in distributions payable	209,367	115,230
Change in deferred Contribution	41,000
Foreign currency translation and other	78,325	196,944
Ending balance	$ 41,458,338	$ 42,325,939

Carrying amount, attributable to noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant