v3.3.0.814
Information for Financial Instruments on Which Fair Value Option was Elected (Detail) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total $ (51,450,000) $ (210,717,000)
Fair value of financial instruments more than one day past due [1] 318,000 4,369,000
Uncollected principal balance on financial instruments that exceeds fair value more than one day past due [1] (5,897,000) (21,876,000)
Corporate Bonds    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total (7,449,000) (7,814,000)
Fair value of financial instruments more than one day past due 0 0
Debt Securities    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total (342,000)  
Corporate Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total (36,356,000) (197,580,000)
Fair value of financial instruments more than one day past due [1] 318,000 4,369,000
Uncollected principal balance on financial instruments that exceeds fair value more than one day past due [1] (5,897,000) (21,876,000)
Loans and Receivables    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total $ (7,303,000) (5,323,000)
Fair value of financial instruments more than one day past due   $ 0
[1] Corporate Loans and Corporate Bonds within CLO assets are classified as past due if contractual payments are more than one day past due.