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

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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.

+ References

No definition available.

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- Definition

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

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Name Regulation S-X (SX)
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-Paragraph 20, 22
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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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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No definition available.

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- Definition

Debt Instrument, Basis Spread on Variable Rate Upon Completion of Initial Ramp-Up Period

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No definition available.

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Debt Instrument, Term of Initial Ramp-Up Period

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No definition available.

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- Definition

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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- Definition

Percentage Of Borrowings On Assets Available As Collateral

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No definition available.

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Consolidation - Additional Information (Details)		3 Months Ended	12 Months Ended
Consolidation - Additional Information (Details)	Aug. 17, 2015 USD ($)	Mar. 31, 2016 USD ($) Product	Dec. 31, 2015 USD ($) Product	Mar. 31, 2015 USD ($)
Variable Interest Entity [Line Items]
Investment of capital		$ 40,000,000	$ 40,000,000
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		$ 3,800,000		$ 15,300,000
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Products - VOEs [Member]
Variable Interest Entity [Line Items]
Number of consolidated products \| Product		20	12
Number of additional products consolidated during the period \| Product		10
Number products deconsolidated during the period \| Product		2
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Product - VIE [Member]
Variable Interest Entity [Line Items]
Number of consolidated products \| Product		1
Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Debt outstanding		$ 155,464,000	$ 152,597,000
Maximum [Member] \| Consolidated Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Percentage of permitted borrowings (up to)		33.33%
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
LIBOR [Member] \| Financing Facility [Member] \| Secured Debt [Member] \| Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	1.25%
Term of initial ramp-up period	9 months
Basis spread on variable interest rate upon completion of initial ramp-up period	2.00%