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

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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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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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.

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Debt Instrument, Number of Classes of Notes

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Investment, Basis Spread on Variable Rate

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Investments, Carrying Amount Exceeds Fair Value

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Number of additional consolidated sponsored investment products.

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Number of sponsored investment products deconsolidated.

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Number of Products Consolidated

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Consolidation - Additional Information (Details)		6 Months Ended	12 Months Ended
Consolidation - Additional Information (Details)	Jun. 09, 2016 USD ($) classes_notes	Jun. 30, 2016 USD ($) Product	Dec. 31, 2015 USD ($) Product	Jun. 30, 2015 USD ($)
Variable Interest Entity [Line Items]
Fair value, securities, Level 1 to Level 2 transfers, amount		$ 0		$ 0
Investment of capital			$ 40,000,000
Investments		567,018,000	579,558,000
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss		6,100,000
Consolidated Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Fair value, securities, Level 2 to Level 1 transfers, amount		100,000		14,600,000
Fair value, securities, Level 1 to Level 2 transfers, amount		4,100,000		$ 0
Investments		$ 130,396,000	$ 323,335,000
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Products - VOEs [Member]
Variable Interest Entity [Line Items]
Number of consolidated products \| Product		18	12
Number of additional products consolidated during the period \| Product		11
Number products deconsolidated during the period \| Product		5
Investments		$ 91,669,000	$ 291,247,000
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Product - VIE [Member]
Variable Interest Entity [Line Items]
Number of consolidated products \| Product		1
Investments		$ 38,727,000	32,088,000
Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Debt outstanding		0	152,597,000
Debt par value	$ 356,300,000.0
Investments		344,886,000	199,485,000
LIBOR [Member] \| Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Investments, basis spread on variable interest rate	7.50%
LIBOR [Member] \| Minimum [Member] \| Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	1.00%
LIBOR [Member] \| Maximum [Member] \| Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	8.75%
Eliminations and Adjustments [Member]
Variable Interest Entity [Line Items]
Investments	$ 36,300,000	$ (132,258,000)	$ (292,409,000)
Financing Facility [Member] \| Secured Debt [Member] \| Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Debt term			3 years
Maximum borrowing capacity			$ 160,000,000.0
Debt outstanding			$ 152,600,000
Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 [Member] \| Senior Notes [Member] \| Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Debt par value	$ 320,000,000
Number of classes of notes \| classes_notes	6
Unpaid principal balance exceeds fair value	$ 3,800,000
Subordinated Notes - Newfleet CLO 2016-1 [Member] \| Subordinated Debt [Member] \| Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Debt par value	$ 36,300,000.0