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v3.8.0.1

Consolidation - Additional Information (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) collateralized_loan_obligation | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($)
Variable Interest Entity [Line Items] |  |  |
Fair value, securities, Level 1 to Level 2 transfers, amount | $ 0 |  | $ 0
CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of CLOs consolidated | collateralized_loan_obligation | 4 |  |
Investments | $ 1,494,992,000 | $ 346,967,000 |
Consolidated investment products |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments | 1,595,727,000 | $ 489,042,000 |
Fair value, securities, Level 2 to Level 1 transfers, amount | 0 |  | 300,000
Fair value, securities, Level 1 to Level 2 transfers, amount | 0 |  | $ 500,000
Nonconsolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value and maximum risk of loss | $ 14,700,000 |  |
LIBOR | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments, basis spread on variable interest rate | 9.50% |  |
LIBOR | Minimum | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Basis spread on variable interest rate | 1.00% |  |
LIBOR | Maximum | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Basis spread on variable interest rate | 8.75% |  |
Senior Notes | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Unpaid principal balance exceeds fair value | $ 6,200,000 |  |
Subordinated Notes - Newfleet CLO 2016-1 | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value | 1,687,000,000.000 |  |
Subordinated Notes - Newfleet CLO 2016-1 | Subordinated Debt | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value | 139,800,000.0 |  |
Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 | Senior Notes | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value | $ 1,548,000,000 |  |

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