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Investments Fair Value Changes, Net - Components of Investment Activities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Investment Holdings [Line Items] |  |  |  |
Investment Fair Value Changes, Net | $ (11,066) | $ (1,788) | $ (30,604) | $ (2,936)
Investment activities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (11,066) | (1,788) | (30,604) | (2,936)
Changes in fair value of risk management derivatives | (9,600) | (2,374) | (45,410) | (3,748)
Investment Fair Value Changes, Net | (11,066) | (1,788) | (30,604) | (2,936)
Investment activities | Residential loans held-for-investment, at Redwood |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (647) | (5,885) | 22,816 | (3,907)
Investment activities | Trading Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 431 | 6,927 | (5,170) | 7,197
Investment activities | Net investments in consolidated Sequoia entities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (251) | (684) | (1,831) | (1,777)
Investment activities | Risk sharing investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (694) | 228 | (704) | (701)
Investment activities | Impaired on AFS securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ (305) | $ 0 | $ (305) | $ 0

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- Definition Amount of unrealized gain (loss) related to the fair value of price risk derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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