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Summary of Classifications and Carrying Value of Residential Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Residential loans $ 2,724,381 $ 2,166,434
Residential Loans at Fair Value
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,110,000 403,000
Residential Loans at Fair Value | Conforming Loan
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 259,675 11,502
Residential Loans at Fair Value | Jumbo Loan
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 846,564 391,100
Residential Loans at Lower of Cost or Fair Value
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,638 1,665
Residential Loans Held for Investment
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,616,504 1,762,167
Redwood
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,107,877 404,267
Redwood | Residential Loans at Fair Value | Conforming Loan
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 259,675 11,502
Redwood | Residential Loans at Fair Value | Jumbo Loan
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 846,564 391,100
Redwood | Residential Loans at Lower of Cost or Fair Value
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,638 1,665
Sequoia
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans 1,616,504 1,762,167
Sequoia | Residential Loans Held for Investment
    
Mortgage Loans on Real Estate [Line Items]    
Residential loans $ 1,616,504 $ 1,762,167