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Derivative Financial Instruments - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) counterparty | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) counterparty | Sep. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2013 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  | $ 7,538,483 |  | $ 7,538,483 |  |  | $ 3,663,084 |  |
Accumulated other comprehensive income (loss) | [1] | $ 119,721 |  | $ 119,721 |  |  | 140,688 |  |
Number of counterparties | counterparty |  | 8 |  | 8 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Hedges decrease in value recorded as a component of interest expense (less than) |  | $ 1,000 | $ 100 | $ 100 | $ 100 |  |  |  |
Net unrealized losses on interest rate agreements accounted for as cash flow hedges |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  | (50,995) | (33,211) | (50,995) | (33,211) | $ (38,965) | (46,049) | $ (29,985) | $ (15,888)
Mortgage banking and investment activities |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Market valuations gains and losses, net |  | (14,122) | 12,796 | (9,945) | 7,731 |  |  |  |
Loan Purchase and Forward Sales Commitments | Mortgage banking and investment activities |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Market valuations gains and losses, net |  | 25,173 | 2,487 | 44,482 | 6,077 |  |  |  |
Interest rate swaps | Maximum |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss that will be amortized into interest expense (less than) |  | 1,000 |  | 1,000 |  |  |  |  |
Interest rate swaps | Cash Flow Hedging |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  | 140,000 |  | 140,000 |  |  |  |  |
Valuation adjustments on derivatives |  | (12,000) | (3,000) | (5,000) | (17,000) |  |  |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Valuation adjustments on derivatives |  | (29,000) | $ (4,000) |  | $ (29,000) |  |  |  |
Unsecuritized Residential and Commercial Loans | Maximum |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Valuation adjustments on derivatives |  |  |  | (58,000) |  |  |  |  |
Unsecuritized Residential and Commercial Loans | Interest Rate Contract |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  | 2,410,000 |  | 2,410,000 |  |  | 920,000 |  |
Unsecuritized Residential and Commercial Loans | Futures |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  | 36,000 |  | 36,000 |  |  | 90,000 |  |
Unsecuritized Residential and Commercial Loans | TBAs |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  | $ 3,380,000 |  | $ 3,380,000 |  |  | $ 2,180,000 |  |
[1] | Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At September 30, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,539,350 and $1,900,208, respectively. At September 30, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,179,884 and $1,546,490, respectively. See Note 4 for further discussion.

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