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Consolidation - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) Product | Jun. 09, 2016 USD ($) classes_notes | Dec. 31, 2015 USD ($) Product
VIE, not primary beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value and maximum risk of loss | $ 9,000,000 |  |
Eliminations and adjustments [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments |  | $ 36,300,000 |
Consolidated Sponsored Investment Products [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Fair value, securities, Level 2 to Level 1 transfers, amount | 3,700,000 |  | $ 8,400,000
Fair value, securities, Level 1 to Level 2 transfers, amount | 0 |  | 200,000
Investments | $ 142,075,000 |  | $ 323,335,000
Consolidated Sponsored Investment Products [Member] | Consolidated Sponsored Investment Products - VOEs [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of consolidated products | Product | 19 |  | 12
Number of additional products consolidated during the period | Product | 12 |  |
Number products deconsolidated during the period | Product | 5 |  |
Investments | $ 99,247,000 |  | $ 291,247,000
Consolidated Sponsored Investment Products [Member] | Maximum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage of total assets permitted to borrow | 33.33% |  |
Consolidated Investment Product [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value |  | 356,300,000.0 |
Debt outstanding | $ 0 |  | 152,597,000
Investments | $ 346,967,000 |  | $ 199,485,000
Consolidated Investment Product [Member] | LIBOR [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments, basis spread on variable interest rate | 8.25% |  |
Consolidated Investment Product [Member] | LIBOR [Member] | Minimum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Basis spread on variable interest rate | 1.00% |  |
Consolidated Investment Product [Member] | LIBOR [Member] | Maximum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Basis spread on variable interest rate | 8.75% |  |
Consolidated Investment Product [Member] | CLO senior secured floating rate notes [Member] | Senior notes [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value |  | $ 320,000,000.0 |
Number of classes of notes | classes_notes |  | 6 |
Unpaid principal balance exceeds fair value | $ 1,300,000 |  |
Consolidated Investment Product [Member] | CLO subordinated notes [Member] | Subordinated debt [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value |  | $ 36,300,000.0 |
Consolidated Investment Product [Member] | CLO warehouse debt [Member] | Secured debt [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt outstanding |  | $ 152,600,000 |

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