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Derivative Financial Instruments - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) counterparty | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Derivative [Line Items] |  |  |  |
Notional amount |  | $ 6,483,976 | $ 3,663,084 |
Accumulated other comprehensive income | [1] | $ 91,993 | 140,688 |
Number of counterparties | counterparty |  | 6 |  |
Cash Flow Hedging | Interest Rate Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  | $ 140,000 |  |
Valuation adjustments on derivatives |  | (1,000) | (30,000) | $ 32,000
Unsecuritized Residential and Commercial Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Valuation adjustments on derivatives |  | (65,000) | (39,000) | 51,000
Unsecuritized Residential and Commercial Loans | Interest Rate Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  | 2,620,000 | 920,000 |
Unsecuritized Residential and Commercial Loans | Futures |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  | 78,000 | 90,000 |
Unsecuritized Residential and Commercial Loans | TBAs |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  | 2,480,000 | 2,180,000 |
Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Realized net losses reclassified from other comprehensive income (less than) |  | 1,000 | 1,000 | 1,000
Maximum | Interest Rate Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Accumulated other comprehensive loss that will be amortized into interest expense |  | (1,000) |  |
Mortgage Banking And Investment Activities |  |  |  |
Derivative [Line Items] |  |  |  |
Changes in fair value of assets |  | (14,875) | 20,783 | 85,706
Loan Purchase and Forward Sales Commitments | Mortgage Banking And Investment Activities |  |  |  |
Derivative [Line Items] |  |  |  |
Changes in fair value of assets |  | 50,234 | 13,891 | (399)
Net unrealized losses on interest rate agreements accounted for as cash flow hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Accumulated other comprehensive income |  | $ (47,363) | $ (46,049) | $ (15,888)
[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 December 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,195,574 and $1,900,208, respectively. At December 31, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,050,861 and $1,546,490, 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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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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