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Consolidation - Additional Information (Details) |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
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 |  |  |

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