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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights income (loss), net $ 2,783 $ 830 $ 9,064 $ (10,094)
Total Market gains and losses, net (9,736) (2,043) (25,584) (21,478)
Mortgage banking activities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net 7,442 5,884 14,679 7,114
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 5,859 (3,176) 11,298 (1,118)
Mortgage banking activities | Residential loan purchase and forward sale commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net 10,852 1,054 23,487 19,309
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 0 987 433 6,845
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 (29) 0 1,455 (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 (9,240) 7,019 (21,994) (3,563)
Investment activities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (11,066) (1,788) (30,604) (2,936)
Investment activities | Consolidated Sequoia entities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (251) (684) (1,831) (1,777)
Investment activities | Risk managment derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (9,600) (2,374) (45,410) (3,748)
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 (647) (5,885) 22,816 (3,907)
Investment activities | Trading securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net 431 6,927 (5,170) 7,197
Investment activities | Risk sharing investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (694) 228 (704) (701)
Investment activities | Impaired on AFS securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Market valuations gains and losses, net (305) 0 (305) 0
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 (6,112) (6,139) (9,659) (25,656)
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 21,153 (21,814) 62,210 (21,814)
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 $ (27,265) $ 15,675 $ (71,869) $ (3,842)