Redeemable Noncontrolling Interests - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Value at December 31, 2017	$ 4,178
Business acquisition	55,500
Net income (loss) attributable to noncontrolling interests	743	$ 1,709
Net subscriptions (redemptions) and other	(173)
Value at September 30, 2018	60,248
Consolidated investment products
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Value at December 31, 2017	4,178
Business acquisition	0
Net income (loss) attributable to noncontrolling interests	(44)
Net subscriptions (redemptions) and other	(173)
Value at September 30, 2018	3,961
Affiliate Noncontrolling Interests
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Value at December 31, 2017	0
Business acquisition	55,500
Net income (loss) attributable to noncontrolling interests	787
Net subscriptions (redemptions) and other	0
Value at September 30, 2018	$ 56,287

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 increase in noncontrolling interest from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Redemption value, as if currently redeemable, of redeemable noncontrolling interest classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 24(b)
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

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- Definition

The portion of net income or loss attributable to temporary equity interest.

+ References

No definition available.

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- Definition

Noncontrolling Interest, Subscriptions (Redemptions)

+ References

No definition available.

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