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

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Investment, Basis Spread on Variable Rate

+ References

No definition available.

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- Definition

Investments, Carrying Amount Exceeds Fair Value

+ References

No definition available.

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- Definition

Number of Collateralized Loan Obligations Consolidated

+ References

No definition available.

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Consolidation - Additional Information (Details)	3 Months Ended
Consolidation - Additional Information (Details)	Mar. 31, 2018 USD ($) collateralized_loan_obligation	Dec. 31, 2017 USD ($)	Mar. 31, 2017 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	$ 1,572,898,000	$ 1,555,879,000
Consolidated investment products
Variable Interest Entity [Line Items]
Investments	1,634,085,000	$ 1,597,752,000
Fair value, securities, Level 2 to Level 1 transfers, amount	0		300,000
Fair value, securities, Level 1 to Level 2 transfers, amount	800,000		$ 400,000
Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss	$ 57,300,000
LIBOR \| CLOs
Variable Interest Entity [Line Items]
Investments, basis spread on variable interest rate	10.00%
LIBOR \| Minimum \| CLOs
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	0.80%
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	$ 3,900,000
Subordinated Notes - Newfleet CLO 2016-1 \| CLOs
Variable Interest Entity [Line Items]
Debt par value	1,585,800,000.0000
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	$ 1,446,000,000.0000