v2.4.0.8
Information for Financial Instruments on Which Fair Value Option was Elected (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total $ (353,954) $ (587,726)
Fair value of financial instruments more than one day past due 52,986 [1] 36,153 [1]
Uncollected principal balance on financial instruments that exceeds fair value more than one day past due (143,727) [1] (73,335) [1]
Loans And Receivables
    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total (1,223) (292)
Corporate Loans
    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total (351,515) (586,450)
Fair value of financial instruments more than one day past due 52,986 [1] 35,322 [1]
Uncollected principal balance on financial instruments that exceeds fair value more than one day past due (143,727) [1] (73,291) [1]
Corporate Bonds
    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Uncollected principal balance on financial instruments that exceeded fair value total (1,216) (984)
Fair value of financial instruments more than one day past due   831 [1]
Uncollected principal balance on financial instruments that exceeds fair value more than one day past due   $ (44) [1]
[1] Past due Corporate Loans and Corporate Bonds within CLO assets are classified as past due if contractual payments are more than one day past due.