Consolidation - Additional Information (Details)	12 Months Ended
Dec. 31, 2018 USD ($) collateralized_loan_obligation	Dec. 31, 2017 USD ($)
Variable Interest Entity [Line Items]
Transfers between level 1 and level 2	$ 0	$ 0
CLOs
Variable Interest Entity [Line Items]
Number of consolidated CLOs \| collateralized_loan_obligation	5
Number of consolidated CLOs, in warehouse-stage \| collateralized_loan_obligation	1
Investments	$ 1,709,266,000	1,555,879,000
Transfers between level 2 and level 1	0
Transfers between level 1 and level 2	$ 0
CLOs \| London Interbank Offered Rate (LIBOR)
Variable Interest Entity [Line Items]
Investments, basis spread on variable interest rate	8.75%
CLOs \| London Interbank Offered Rate (LIBOR) \| Minimum
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	0.80%
CLOs \| London Interbank Offered Rate (LIBOR) \| Maximum
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	7.00%
CLOs \| Senior notes
Variable Interest Entity [Line Items]
Unpaid principal balance exceeds fair value	$ 49,700,000
CLOs \| CLO senior secured floating rate notes \| Senior notes
Variable Interest Entity [Line Items]
Debt par value	1,400,000,000.0
CLOs \| CLO subordinated notes
Variable Interest Entity [Line Items]
Debt par value	1,800,000,000.0
CLOs \| CLO subordinated notes \| Warehouse Facility Debt
Variable Interest Entity [Line Items]
Debt par value	155,700,000.0
CLOs \| CLO subordinated notes \| Subordinated debt
Variable Interest Entity [Line Items]
Debt par value	179,800,000.0
Consolidated investment products
Variable Interest Entity [Line Items]
Investments	1,749,568,000	1,597,752,000
Transfers between level 2 and level 1		0
Transfers between level 1 and level 2		$ 0
Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss	$ 16,400,000

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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