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Principles of Consolidation - Key Assumptions and Sensitivity Analysis for Assets Retained from Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Mortgage servicing rights
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value	$ 30,976	$ 56,984
Expected life (in years)	5 years	7 years
Prepayment speed assumption (annual CPR)	28.00%	11.00%
Decrease in fair value from:
10% adverse change	$ 2,390	$ 2,868
25% adverse change	$ 5,631	$ 6,119
Discount rate assumption	11.00%	11.00%
Decrease in fair value from:
100 basis point increase	$ 706	$ 2,711
200 basis point increase	1,373	4,745
Senior Securities
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value	$ 17,710	$ 248,570
Expected life (in years)	4 years	5 years
Prepayment speed assumption (annual CPR)	12.00%	10.00%
Decrease in fair value from:
10% adverse change	$ 688	$ 2,042
25% adverse change	$ 1,648	$ 4,810
Discount rate assumption	21.00%	5.00%
Decrease in fair value from:
100 basis point increase	$ 442	$ 10,029
200 basis point increase	$ 862	$ 19,365
Credit loss assumption	0.25%	0.25%
Decrease in fair value from:
10% higher losses	$ 8	$ 35
25% higher losses	21	86
Interest Only Securities
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value	18,000	31,000
Subordinate Securities
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value	$ 267,587	$ 282,842
Expected life (in years)	11 years	12 years
Prepayment speed assumption (annual CPR)	13.00%	12.00%
Decrease in fair value from:
10% adverse change	$ 885	$ 901
25% adverse change	$ 2,229	$ 2,278
Discount rate assumption	6.00%	6.00%
Decrease in fair value from:
100 basis point increase	$ 20,724	$ 21,981
200 basis point increase	$ 38,779	$ 41,156
Credit loss assumption	0.25%	0.25%
Decrease in fair value from:
10% higher losses	$ 1,225	$ 1,244
25% higher losses	$ 3,074	$ 3,129

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Sensitivity Analysis of Fair Value of Interests that Continue to be Held by Transferor, Servicing Assets or Liabilities [Abstract]

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Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Expected Credit Losses [Abstract]

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Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Adverse Change In Prepayment Speed [Abstract]

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The hypothetical financial impact of a 200 basis point adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

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The hypothetical financial impact of a 10 percent adverse change of the expected credit losses, including expected static pool losses, on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a specified adverse percentage change in discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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A specified percentage variance in the discount rate assumption in the determination of fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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