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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights income (loss), net $ 6,281 $ (10,924)
Total Market gains and losses, net (15,848) (19,435)
Loan Purchase and Forward Sales Commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 13,000 18,000
Mortgage banking activities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 7,237 1,227
Mortgage banking activities | Residential Loans at Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 5,439 2,056
Mortgage banking activities | Loan Purchase and Forward Sales Commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 12,635 18,256
Mortgage banking activities | Commercial Loans at Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 433 5,857
Mortgage banking activities | Consolidated Sequoia entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 1,484 (14,359)
Mortgage banking activities | Risk managment derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (12,754) (10,583)
Investment activities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (19,538) (1,145)
Investment activities | Consolidated Sequoia entities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (1,580) (1,093)
Investment activities | Residential loans held-for-investment, at Redwood    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 23,463 1,980
Investment activities | Real estate securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (5,601) 270
Investment activities | Risk managment derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (35,810) (1,374)
Investment activities | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (10) (928)
MSR Income (loss), net, including risk management derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights income (loss), net (3,547) (19,517)
MSR Income (loss), net, including risk management derivatives | Risk managment derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights income (loss), net 41,057 0
MSR Income (loss), net, including risk management derivatives | Mortgage servicing rights    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights income (loss), net $ (44,604) $ (19,517)