Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Debt Instrument, Number of Classes of Notes

+ References

No definition available.

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- Definition

Investment, Basis Spread on Variable Rate

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No definition available.

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- Definition

Investments, Carrying Amount Exceeds Fair Value

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No definition available.

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- Definition

Number of sponsored investment products deconsolidated.

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Number of Products Consolidated

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Consolidation - Additional Information (Details)	3 Months Ended
Consolidation - Additional Information (Details)	Mar. 31, 2017 USD ($) Product classes_notes	Dec. 31, 2016 USD ($) Product	Mar. 31, 2016 USD ($)
Variable Interest Entity [Line Items]
Fair value, securities, Level 1 to Level 2 transfers, amount	$ 0		$ 0
Consolidated Sponsored Investment Products
Variable Interest Entity [Line Items]
Fair value, securities, Level 2 to Level 1 transfers, amount	300,000		3,800,000
Fair value, securities, Level 1 to Level 2 transfers, amount	400,000		$ 0
Investments	$ 112,930,000	$ 142,075,000
Consolidated Sponsored Investment Products \| Consolidated Sponsored Investment Products - VOEs
Variable Interest Entity [Line Items]
Number of consolidated products \| Product	18	19
Number products deconsolidated during the period \| Product	1
Investments	$ 61,028,000	$ 99,247,000
Consolidated Sponsored Investment Products \| Consolidated Sponsored Investment Product - VIE
Variable Interest Entity [Line Items]
Number of consolidated products \| Product	1
Investments	$ 51,902,000	42,828,000
Consolidated Investment Product
Variable Interest Entity [Line Items]
Investments	354,002,000	$ 346,967,000
Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss	$ 9,600,000
LIBOR \| Consolidated Investment Product
Variable Interest Entity [Line Items]
Investments, basis spread on variable interest rate	9.50%
LIBOR \| Minimum \| Consolidated Investment Product
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	1.00%
LIBOR \| Maximum \| Consolidated Investment Product
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	8.75%
Senior Notes \| Consolidated Investment Product
Variable Interest Entity [Line Items]
Unpaid principal balance exceeds fair value	$ 600,000
Subordinated Notes - Newfleet CLO 2016-1 \| Consolidated Investment Product
Variable Interest Entity [Line Items]
Debt par value	356,300,000.0
Subordinated Notes - Newfleet CLO 2016-1 \| Subordinated Debt \| Consolidated Investment Product
Variable Interest Entity [Line Items]
Debt par value	36,300,000.0
Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 \| Senior Notes \| Consolidated Investment Product
Variable Interest Entity [Line Items]
Debt par value	$ 320,000,000.0
Number of classes of notes \| classes_notes	6