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
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Balance, Beginning of Period $ 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 42,017 17,820
Settlements (2,034,897) (898,890)
Realized (Gains) Losses, Net 6,078 (17)
Changes in Unrealized (Gains) Losses Included in Earnings Related to Liabilities Still Held at the Reporting Date 609,969 774,383
Balance, End of Period 8,913,007 11,541,607
Collateralized Loan Obligations Senior Notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Balance, Beginning of Period 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 41,233 15,602
Settlements (2,034,367) (895,302)
Realized (Gains) Losses, Net 6,078 (17)
Changes in Unrealized (Gains) Losses Included in Earnings Related to Liabilities Still Held at the Reporting Date 695,334 706,003
Balance, End of Period 8,302,572 10,695,136
Collateralized Loan Obligations Subordinated Notes
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Balance, Beginning of Period 846,471 630,236
Transfer In Due to Consolidation and Acquisition   149,225 [1]
Transfer Out Due to Deconsolidation (150,925)  
Issuances 784 2,218
Settlements (530) (3,588)
Changes in Unrealized (Gains) Losses Included in Earnings Related to Liabilities Still Held at the Reporting Date (85,365) 68,380
Balance, End of Period $ 610,435 $ 846,471
[1] Represents the transfer into Level III of financial assets and liabilities as a result of the consolidation of certain fund entities, the acquisition of management contracts and the Harbourmaster acquisition.