v2.4.0.8
Summary of Changes in Financial Liabilities Measured at Fair Value for Which Level III Inputs Were Used (Detail) (Level 3, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Balance, Beginning of Period $ 9,808,630 $ 11,235,901 $ 11,541,607 $ 8,080,002
Transfer In Due to Consolidation and Acquisition       3,568,309 [1]
Transfer Out Due to Deconsolidation     (1,251,767)  
Issuances 2,425 12,303 4,255 16,284
Settlements (788,098) (338,794) (1,492,821) (612,910)
Realized (Gains) Losses, Net 2,833 (60) 2,833 (17)
Changes in Unrealized (Gains) Losses Included in Earnings Related to Liabilities Still Held at the Reporting Date 221,097 514,476 442,780 372,158
Balance, End of Period 9,246,887 11,423,826 9,246,887 11,423,826
Collateralized Loan Obligations Senior Notes
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Balance, Beginning of Period 9,189,948 10,534,253 10,695,136 7,449,766
Transfer In Due to Consolidation and Acquisition       3,419,084 [1]
Transfer Out Due to Deconsolidation     (1,100,842)  
Issuances 1,503 10,844 2,558 14,073
Settlements (787,918) (338,222) (1,492,295) (609,440)
Realized (Gains) Losses, Net 2,833 (60) 2,833 (17)
Changes in Unrealized (Gains) Losses Included in Earnings Related to Liabilities Still Held at the Reporting Date 235,141 405,687 534,117 339,036
Balance, End of Period 8,641,507 10,612,502 8,641,507 10,612,502
Collateralized Loan Obligations Subordinated Notes
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Balance, Beginning of Period 618,682 701,648 846,471 630,236
Transfer In Due to Consolidation and Acquisition       149,225 [1]
Transfer Out Due to Deconsolidation     (150,925)  
Issuances 922 1,459 1,697 2,211
Settlements (180) (572) (526) (3,470)
Changes in Unrealized (Gains) Losses Included in Earnings Related to Liabilities Still Held at the Reporting Date (14,044) 108,789 (91,337) 33,122
Balance, End of Period $ 605,380 $ 811,324 $ 605,380 $ 811,324
[1] Represents the transfer into Level III of financial assets and liabilities held by CLO vehicles as a result of the acquisition of management contracts and the Harbourmaster acquisition.