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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

Increase (Decrease) in Fair Value Adjustments on Assets

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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