Partnership's Borrowings Through Consolidated CLO Vehicles (Detail) - Partnership's Borrowings Through Consolidated CLO Vehicles - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Borrowing Outstanding	$ 4,020,535	$ 3,914,326
Senior Secured Notes
Debt Instrument [Line Items]
Borrowing Outstanding	$ 3,786,464	$ 3,687,976
Weighted Average Interest Rate	1.94%	1.93%
Weighted Average Remaining Maturity in Years	5 years 6 months	5 years 4 months 24 days
Subordinated Notes
Debt Instrument [Line Items]
Borrowing Outstanding	$ 234,071	$ 226,350

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant