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Fair Value of Financial Instruments - Portion of Net Gains (Losses) Attributable to Level 3 Assets and Liabilities Still Held Included in Net Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Commercial Secured Borrowings |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income | $ 2,171 | $ (1,509)
Asset-backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income | (33,515) | (2,946)
Residential Loans Held For Investment at Fair Value | Residential loans at Redwood |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 27,285 | 5,464
Residential Loans Held For Investment at Fair Value | Residential loans at consolidated Sequoia entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | (35,656) | 1,179
Guarantee Asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | (1,425) | (1,083)
Commercial Loans at Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 2,171 | 2,959
Trading Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | (6,135) | (13,790)
Mortgage servicing rights |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | (30,834) | (11,769)
Loan Purchase Commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net gains (losses) attributable to level 3 assets still held included in net income | $ 4,644 | $ 7,422

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