Redeemable Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2016
Redeemable noncontrolling interests in consolidated sponsored funds
Net income (loss) attributable to redeemable noncontrolling interests	$ (124)	$ 377
Ending balance of redeemable noncontrolling interest in consolidated sponsored funds	10,865	10,865
Consolidated Sponsored Funds
Redeemable noncontrolling interests in consolidated sponsored funds
Redeemable noncontrolling interests in sponsored funds upon adoption of new accounting guidance on January 1, 2016		14,330
Redeemable noncontrolling interests in sponsored funds consolidated during the period		18,249
Redeemable noncontrolling interests ownership change during the period		22,143
Redeemable noncontrolling interests deconsolidation		(44,234)
Net income (loss) attributable to redeemable noncontrolling interests		377
Ending balance of redeemable noncontrolling interest in consolidated sponsored funds	$ 10,865	$ 10,865

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 27
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 7

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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- Definition

The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Represents the initial redeemable noncontrolling interests consolidation.

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Amount of increase in non-controlling interest from adoption of consolidation guidance for non-controlling interests in sponsored funds.

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Amount of increase in noncontrolling interests from ownership change of noncontrolling interests holders.

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