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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)

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- Definition The aggregate net change in market value for certain assets and liabilities that was included in earnings for the period. This includes changes in market values for assets and liabilities accounted for at fair value, as well as the credit portion of other-than-temporary impairments on securities available for sale, impairments on loans held-for-sale and real estate owned. + References No definition available. + Details
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