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Consolidation - Additional Information (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
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% |  |  |

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