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Assets and Liabilities of Consolidated VIEs (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Entity
Investment
Location
Dec. 31, 2010
Variable Interest Entity [Line Items]    
Assets $ 4,008,364  
Liabilities 3,912,958 3,838,386
Noncontrolling interest 2,106 10,839
Number of VIEs 49  
Sequoia
   
Variable Interest Entity [Line Items]    
Assets 3,676,923  
Liabilities 3,570,622  
Number of VIEs 38  
Sequoia | Real Estate Loans
   
Variable Interest Entity [Line Items]    
Assets 3,654,932  
Sequoia | Other Assets
   
Variable Interest Entity [Line Items]    
Assets 21,991  
Sequoia | Asset-backed Securities
   
Variable Interest Entity [Line Items]    
Liabilities 3,566,001  
Sequoia | Other Liabilities
   
Variable Interest Entity [Line Items]    
Liabilities 4,621  
Acacia
   
Variable Interest Entity [Line Items]    
Assets 326,338  
Liabilities 342,316  
Number of VIEs 10  
Acacia | Real Estate Loans
   
Variable Interest Entity [Line Items]    
Assets 12,698  
Acacia | Real Estate Securities
   
Variable Interest Entity [Line Items]    
Assets 276,527  
Acacia | Other Assets
   
Variable Interest Entity [Line Items]    
Assets 37,113  
Acacia | Asset-backed Securities
   
Variable Interest Entity [Line Items]    
Liabilities 273,325  
Acacia | Other Liabilities
   
Variable Interest Entity [Line Items]    
Liabilities 68,991  
The Fund
   
Variable Interest Entity [Line Items]    
Assets 5,103  
Liabilities 20  
Noncontrolling interest 2,106  
Number of VIEs 1  
The Fund | Other Assets
   
Variable Interest Entity [Line Items]    
Assets 5,103  
The Fund | Other Liabilities
   
Variable Interest Entity [Line Items]    
Liabilities 20  
Real Estate Loans
   
Variable Interest Entity [Line Items]    
Assets 3,667,630  
Real Estate Securities
   
Variable Interest Entity [Line Items]    
Assets 276,527  
Other Assets
   
Variable Interest Entity [Line Items]    
Assets 64,207  
Asset-backed Securities
   
Variable Interest Entity [Line Items]    
Liabilities 3,839,326  
Other Liabilities
   
Variable Interest Entity [Line Items]    
Liabilities $ 73,632