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Consolidation - Additional Information (Details)	3 Months Ended
Consolidation - Additional Information (Details)	Mar. 31, 2019 USD ($) collateralized_loan_obligation	Dec. 31, 2018 USD ($)	Mar. 31, 2018 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	5
Investments	$ 1,723,411,000	$ 1,709,266,000
Consolidated investment products
Variable Interest Entity [Line Items]
Investments	1,767,942,000	$ 1,749,568,000
Fair value, securities, Level 2 to Level 1 transfers, amount	0		0
Fair value, securities, Level 1 to Level 2 transfers, amount	0		$ 0
Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss	$ 12,900,000
LIBOR \| CLOs
Variable Interest Entity [Line Items]
Investments, basis spread on variable interest rate	8.75%
Senior Notes \| CLOs
Variable Interest Entity [Line Items]
Unpaid principal balance exceeds fair value	$ 36,800,000
Subordinated Notes - Newfleet CLO 2016-1 \| CLOs
Variable Interest Entity [Line Items]
Debt par value	1,782,500,000
Subordinated Notes - Newfleet CLO 2016-1 \| Warehouse Facility Debt \| CLOs
Variable Interest Entity [Line Items]
Debt par value	156,700,000
Subordinated Notes - Newfleet CLO 2016-1 \| Subordinated Debt \| CLOs
Variable Interest Entity [Line Items]
Debt par value	179,800,000
Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 \| Senior Notes \| CLOs
Variable Interest Entity [Line Items]
Debt par value	$ 1,446,000,000