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Residential Loans - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Contract
Jun. 30, 2013
Dec. 31, 2013
Contract
Mortgage Loans on Real Estate [Line Items]          
Carrying value $ 2,724,381,000   $ 2,724,381,000   $ 2,166,434,000
Residential Loans
         
Mortgage Loans on Real Estate [Line Items]          
Charge-offs, net 994,000 1,751,000 1,478,000 2,545,000  
Loss confirmation period     23 months    
Average recorded investment of loans individually evaluated for impairment 13,000,000 7,000,000 11,000,000 7,000,000  
Interest income recognized on impaired loans 29,000 10,000 67,000 21,000  
Residential Loans Held for Investment
         
Mortgage Loans on Real Estate [Line Items]          
Principal value 1,625,890,000   1,625,890,000   1,770,803,000
Carrying value 1,616,504,000   1,616,504,000   1,762,167,000
Unamortized premium, net 14,586,000   14,586,000   16,791,000
Weighted average original loan-to-value (LTV) 66.00%   66.00%    
Weighted average original Fair Isaac Corporation (FICO) score 733   733    
Charge-offs, net 1,000,000 2,000,000 1,000,000 3,000,000  
Principal value 6,000,000 5,000,000 8,000,000 7,000,000  
Residential Loans Held for Investment | Residential Loans Acquired Prior To July 1st 2004
         
Mortgage Loans on Real Estate [Line Items]          
Principal value 663,000,000   663,000,000   731,000,000
Unamortized premium, net 9,000,000   9,000,000   11,000,000
Percentage of loans prepaid     9.00%    
Percentage of premiums amortized     16.00%    
Residential Loans Held for Investment | Residential Loans Acquired After July 1st 2004
         
Mortgage Loans on Real Estate [Line Items]          
Principal value 966,000,000   966,000,000   1,000,000,000
Unamortized premium, net 6,000,000   6,000,000   6,000,000
Percentage of loans prepaid     7.00%    
Percentage of premiums amortized     9.00%    
Residential Loans Held for Investment | First Mortgage
         
Mortgage Loans on Real Estate [Line Items]          
Percentage of loan portfolio 99.00%   99.00%    
Residential Loans Held for Investment | Second Mortgage
         
Mortgage Loans on Real Estate [Line Items]          
Percentage of loan portfolio 1.00%   1.00%    
Residential Loans at Fair Value
         
Mortgage Loans on Real Estate [Line Items]          
Number of loans     2,038   537
Principal value 1,070,000,000   1,070,000,000   399,000,000
Principal value 1,740,000,000   2,820,000,000    
Carrying value 1,110,000,000   1,110,000,000   403,000,000
Positive Valuation adjustments 13,375,000 (41,405,000) 20,403,000 (6,535,000)  
Residential Loans at Lower of Cost or Fair Value
         
Mortgage Loans on Real Estate [Line Items]          
Number of loans     10   10
Principal value 2,000,000   2,000,000   2,000,000
Carrying value 1,638,000   1,638,000   1,665,000
Valuation adjustments $ 13,000   $ 11,000