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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Assets
Trading securities		$ 114,211	$ 111,606
Available-for-sale securities		971,013	1,267,624
Derivative assets	[1]	38,623	16,417
MSRs		162,726	139,293	[1]
Pledged collateral			9,927
Liabilities
Derivative liabilities	[1]	88,044	58,331
Commercial secured borrowings		65,578	$ 66,707
Fair Value, Measurements, Recurring
Assets
Trading securities		114,211
Available-for-sale securities		971,013
Derivative assets		38,623
MSRs		162,726
Pledged collateral		28,482
FHLBC stock		30,001
Guarantees asset		5,120
Liabilities
Derivative liabilities		88,044
Commercial secured borrowings		65,578
ABS issued		1,105,588
Fair Value, Measurements, Recurring | Residential Loans at Fair Value
Assets
Loans at fair value		4,035,228
Fair Value, Measurements, Recurring | Commercial Loans at Fair Value
Assets
Loans at fair value		150,852
Fair Value, Measurements, Recurring | Level 1
Assets
Derivative assets		8,910
Pledged collateral		28,482
FHLBC stock		30,001
Liabilities
Derivative liabilities		15,182
Fair Value, Measurements, Recurring | Level 2
Assets
Derivative assets		19,580
Liabilities
Derivative liabilities		72,415
Fair Value, Measurements, Recurring | Level 2 | Residential Loans at Fair Value
Assets
Loans at fair value		236,314
Fair Value, Measurements, Recurring | Level 3
Assets
Trading securities		114,211
Available-for-sale securities		971,013
Derivative assets		10,133
MSRs		162,726
Guarantees asset		5,120
Liabilities
Derivative liabilities		447
Commercial secured borrowings		65,578
ABS issued		1,105,588
Fair Value, Measurements, Recurring | Level 3 | Residential Loans at Fair Value
Assets
Loans at fair value		3,798,914
Fair Value, Measurements, Recurring | Level 3 | Commercial Loans at Fair Value
Assets
Loans at fair value		$ 150,852
[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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