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Summary of Financial Instruments for Which Fair Value Option Has Been Elected (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Preferred Securities $ 271,905 $ 102,907
Total Assets 4,012,678 6,760,099
Total Liabilities 3,355,608 6,797,104
Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets of Consolidated CLO Vehicles: Corporate Bonds 351,674 292,690
Senior Secured Notes | Liabilities of Consolidated CLO Vehicles    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of Notes 3,244,579 6,448,352
Subordinated Notes | Liabilities of Consolidated CLO Vehicles    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of Notes 111,029 348,752
Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets of Consolidated CLO Vehicles: Other   44,513
Loans and Receivables    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and Receivables 179,255 40,397
Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities 15,260  
Corporate Loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets of Consolidated CLO Vehicles: Corporate Loans $ 3,194,584 $ 6,279,592