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Summary of Classifications and Carrying Value of Residential Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Residential loans $ 3,287,587 $ 2,166,434
Residential Loans at Fair Value
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,500,000 403,000
Residential Loans at Fair Value | Conforming Loan
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 399,145 11,502
Residential Loans at Fair Value | Jumbo Loan
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,101,782 391,100
Residential Loans at Lower of Cost or Fair Value
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,502 1,665
Residential Loans Held For Investment at Fair Value
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 238,651  
Residential Loans Held For Investment At Amortized Cost
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,546,507 1,762,167
Redwood
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,741,080 404,267
Redwood | Residential Loans at Fair Value | Conforming Loan
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 399,145 11,502
Redwood | Residential Loans at Fair Value | Jumbo Loan
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,101,782 391,100
Redwood | Residential Loans at Lower of Cost or Fair Value
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,502 1,665
Redwood | Residential Loans Held For Investment at Fair Value
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 238,651  
Sequoia
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,546,507 1,762,167
Sequoia | Residential Loans Held For Investment At Amortized Cost
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans $ 1,546,507 $ 1,762,167