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Derivative Financial Instruments - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) counterparty | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) counterparty | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 6,112,412 |  |  | $ 6,112,412 |  |  | $ 6,483,976 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 1,092,603 | [1] | $ 1,264,784 | 1,092,603 | [1] | $ 1,264,784 | 1,146,265 | [1] | $ 1,256,141
Accumulated other comprehensive income (loss) | [1] | $ 46,331 |  |  | $ 46,331 |  |  | 91,993 |  |
Number of counterparties | counterparty |  | 4 |  |  | 4 |  |  |  |  |
Net unrealized losses on interest rate agreements accounted for as cash flow hedges |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  | (47,363) |  |
Mortgage banking activities |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Market valuations gains and losses, net |  | $ 7,442 |  | 5,884 | $ 14,679 |  | 7,114 |  |  |
Loan Purchase and Forward Sales Commitments | Mortgage banking activities |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Market valuations gains and losses, net |  | 10,852 |  | 1,054 | 23,487 |  | 19,309 |  |  |
Interest rate swaps | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  | 140,000 |  |  | 140,000 |  |  |  |  |
Valuation adjustments on derivatives |  | (9,000) |  | 15,000 | (23,000) |  | 7,000 |  |  |
Unsecuritized Residential and Commercial Loans |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Valuation adjustments on derivatives |  | 2,000 |  | $ (17,000) | (5,000) |  | $ (29,000) |  |  |
Unsecuritized Residential and Commercial Loans | Interest rate contract |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  | 2,160,000 |  |  | 2,160,000 |  |  | 2,620,000 |  |
Unsecuritized Residential and Commercial Loans | TBAs |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  | 2,510,000 |  |  | 2,510,000 |  |  | 2,480,000 |  |
Unsecuritized Residential and Commercial Loans | Futures |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 140,000 |  |  | $ 140,000 |  |  | $ 78,000 |  |
[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 June 30, 2016 and December 31, 2015, assets of consolidated VIEs totaled $888,026 and $1,195,574, respectively. At June 30, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $860,256 and $1,050,861, respectively. See Note 4 for further discussion.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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