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Consolidation - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) collateralized_loan_obligation | Dec. 31, 2016 USD ($)
CLOs |  |
Variable Interest Entity [Line Items] |  |
Number of consolidated CLOs | collateralized_loan_obligation | 4 |
Investments | $ 1,555,879,000 | $ 346,967,000
CLOs | London Interbank Offered Rate (LIBOR) |  |
Variable Interest Entity [Line Items] |  |
Investments, basis spread on variable interest rate | 9.50% |
CLOs | London Interbank Offered Rate (LIBOR) | Minimum |  |
Variable Interest Entity [Line Items] |  |
Basis spread on variable interest rate | 1.00% |
CLOs | London Interbank Offered Rate (LIBOR) | Maximum |  |
Variable Interest Entity [Line Items] |  |
Basis spread on variable interest rate | 8.75% |
CLOs | Senior notes |  |
Variable Interest Entity [Line Items] |  |
Unpaid principal balance exceeds fair value | $ 9,700,000 |
CLOs | CLO senior secured floating rate notes | Senior notes |  |
Variable Interest Entity [Line Items] |  |
Debt par value | 1,500,000,000.0 |
CLOs | CLO subordinated notes |  |
Variable Interest Entity [Line Items] |  |
Debt par value | 1,600,000,000.0 |
CLOs | CLO subordinated notes | Subordinated debt |  |
Variable Interest Entity [Line Items] |  |
Debt par value | 139,800,000.0 |
Consolidated investment products |  |
Variable Interest Entity [Line Items] |  |
Investments | 1,597,752,000 | $ 489,042,000
Fair value, securities, Level 2 to Level 1 transfers, amount | 0 |
Nonconsolidated VIEs |  |
Variable Interest Entity [Line Items] |  |
Carrying value and maximum risk of loss | $ 43,200,000 |

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