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Real Estate Securities - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Investment
Location
Jun. 30, 2010
Jun. 30, 2011
Entity
Investment
Location
Jun. 30, 2010
Dec. 31, 2010
Location
Investment
Investment Holdings [Line Items]          
Number of AFS securities 449   449   509
Number of securities in unrealized loss position 89   89   80
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer 28   28   46
Total credit OTTI $ 1,466,000 [1] $ 4,216,000 [1] $ 4,088,000 [1] $ 6,162,000 [1]  
Non-credit component of OTTI 1,189,000 2,870,000 1,879,000 4,539,000  
Subordinate | Residential
         
Investment Holdings [Line Items]          
Loans 31,000,000,000   31,000,000,000    
Percentage of outstanding loan serious delinquencies(90+ days, in foreclosure or REO) 5.65%   5.65%    
Subordinate | Residential | California State
         
Investment Holdings [Line Items]          
Concentration of loans 44.00%   44.00%    
Residential
         
Investment Holdings [Line Items]          
Marketable securities, due from five to ten years 4,000,000   4,000,000    
Trading Securities
         
Investment Holdings [Line Items]          
Unpaid principal balance 1,200,000,000   1,200,000,000   2,100,000,000
Subordinate | Commercial
         
Investment Holdings [Line Items]          
Loans 19,000,000,000   19,000,000,000    
Percentage of outstanding loan serious delinquencies(90+ days, in foreclosure or REO) 6.00%   6.00%    
Subordinate | Commercial | California State
         
Investment Holdings [Line Items]          
Concentration of loans 15.00%   15.00%    
Subordinate | Commercial | Office
         
Investment Holdings [Line Items]          
Percentage of loan portfolio 31.00%   31.00%    
Subordinate | Commercial | Retail
         
Investment Holdings [Line Items]          
Percentage of loan portfolio 34.00%   34.00%    
Subordinate | Commercial | Multi Family
         
Investment Holdings [Line Items]          
Percentage of loan portfolio 12.00%   12.00%    
The Fund
         
Investment Holdings [Line Items]          
Total unrealized losses         $ 10,000,000
[1] For the three months ended June 30, 2011, other-than-temporary impairments were $2,655, of which $1,189 were recognized in Accumulated Other Comprehensive Income. For the three months ended June 30, 2010, other-than-temporary impairments were $7,086, of which $2,870 were recognized in Accumulated Other Comprehensive Income. For the six months ended June 30, 2011, other-than-temporary impairments were $5,967, of which $1,879 were recognized in Accumulated Other Comprehensive Income. For the six months ended June 30, 2010, other-than-temporary impairments were $10,701, of which $4,539 were recognized in Accumulated Other Comprehensive Income.