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Summary of Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) (Variable Interest Entity, Not Primary Beneficiary, USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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On-balance sheet assets, at fair value: |  |  |  |
Maximum loss exposure | $ 542,448 | [1] | $ 515,920 | [1]
Principal balance of loans outstanding | 7,173,303 |  | 6,627,874 |
Principal balance of delinquent loans 30+ days delinquent | 16,482 |  | 14,587 |
Interest-Only and Senior Securities |  |  |  |
On-balance sheet assets, at fair value: |  |  |  |
Securities | 100,613 |  | 110,505 |
Senior and Subordinate Securities |  |  |  |
On-balance sheet assets, at fair value: |  |  |  |
Securities | $ 441,835 |  | $ 405,415 |
[1] | Maximum loss exposure from our involvement with unconsolidated VIEs pertains to the carrying value of our securities retained from these VIEs and represents estimated losses that would be incurred under severe, hypothetical circumstances, such as if the value of our interests and any associated collateral declines to zero. This does not include, for example, any potential exposure to representation and warranty claims associated with our initial transfer of loans into a securitization.

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- Definition This is the amount of the financial instruments that are considered delinquent (past due) at the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e)(4) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
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- Definition Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 + Details
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