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Partnership's Borrowings Through Consolidated CLO Vehicles (Detail) - Partnership's Borrowings Through Consolidated CLO Vehicles - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Borrowing Outstanding $ 3,484,177 $ 7,334,316
Senior Secured Notes    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 3,276,326 $ 6,594,266
Weighted Average Interest Rate 1.91% 1.27%
Weighted Average Remaining Maturity in Years 5 years 1 month 6 days 3 years 9 months 18 days
Subordinated Notes    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 207,851 $ 740,050
Weighted Average Interest Rate [1]
[1] The Subordinated Notes do not have contractual interest rates but instead receive distributions from the excess cash flows of the CLO vehicles.