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Residential Loans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) loan Contract | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) loan Contract
Mortgage Loans on Real Estate [Line Items] |  |  |
Transfers from loans held-for-sale to loans held-for-investment | $ 660,818 | $ 447,840 |
Transfers from loans held-for-investment to loans held-for-sale | 54,747 | 0 |
Principal balance of loans sold during period | 1,240,000 | 2,200,000 |
Carrying value of loans | 3,715,056 |  | $ 3,928,803
Redwood |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | 2,785,029 |  | 2,906,933
Sequoia |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | $ 930,027 |  | $ 1,021,870
Fixed-rate loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Weighted average coupon rate | 4.16% |  |
Residential Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Principal value of loans purchased | $ 1,190,000 | 2,400,000 |
Residential Loans at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of loans | loan | 588 |  | 1,763
Loan Principal | $ 429,000 |  | $ 1,090,000
Valuation adjustments | 5,000 | 2,000 |
Loan pledged as collateral | 414,000 |  |
Carrying value of loans | 440,000 |  | $ 1,110,000
Loans held-for-investment, in foreclosure | $ 1,000 |  |
Residential Loans at Lower of Cost or Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of loans | 9 |  | 9
Loan Principal | $ 2,000 |  | $ 2,000
Financing Receivable, Number Of Loans In Foreclosure | loan | 1 |  |
Carrying value of loans | $ 1,402 |  | 1,433
Residential Loans at Lower of Cost or Fair Value | Redwood |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | 1,402 |  | 1,433
Residential Loans at Lower of Cost or Fair Value | Sequoia |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | $ 0 |  | $ 0
Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of loans | loan | 3,096 |  | 2,398
Loan Principal | $ 2,280,000 |  | $ 1,760,000
Valuation adjustments | 23,000 | 2,000 |
Transfers from loans held-for-sale to loans held-for-investment | 660,000 | 448,000 |
Transfers from loans held-for-investment to loans held-for-sale | $ 54,000 | 0 |
Carrying value of loans |  |  | $ 1,790,000
Weighted average original Fair Isaac Corporation (FICO) score | 772 |  |
Weighted average original loan-to-value (LTV) | 66.00% |  |
Percentage of fixed-rate loans | 99.00% |  |
Residential Loans Held For Investment at Fair Value | Sequoia |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of loans | 4,221 |  | 4,545
Weighted average original Fair Isaac Corporation (FICO) score | 729 |  |
Weighted average original loan-to-value (LTV) | 66.00% |  |
Loans held-for-investment, delinquent greater than 90 days | $ 51,000 |  | $ 59,000
Loans held-for-investment, in foreclosure | 26,000 |  | 32,000
Valuation adjustments | $ (36,000) | $ 3,000 |
Residential Loans Held For Investment at Fair Value | Hybrid loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Weighted average coupon rate | 4.00% |  |
Residential Loans Held for Investment | Sequoia |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan Principal | $ 1,060,000 |  | 1,120,000
Carrying value of loans | 930,000 |  | $ 1,020,000
Mortgage servicing rights |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Servicing Asset at Amortized Cost | $ 1,880,000 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Loans at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Financing Receivable, Number Of Loans Past Due 90 Days Or More | loan | 0 |  | 2
Financing Receivable, Number Of Loans In Foreclosure | loan | 1 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Loans at Lower of Cost or Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Financing Receivable, Number Of Loans Past Due 90 Days Or More | loan | 2 |  | 2,000
Jumbo Loan | Residential Loans at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | $ 438,287 |  | $ 984,486
Jumbo Loan | Residential Loans at Fair Value | Redwood |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | 438,287 |  | 984,486
Jumbo Loan | Residential Loans at Fair Value | Sequoia |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | 0 |  | 0
Jumbo Loan | Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | 3,273,980 |  | 2,813,065
Jumbo Loan | Residential Loans Held For Investment at Fair Value | Redwood |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | 2,343,953 |  | 1,791,195
Jumbo Loan | Residential Loans Held For Investment at Fair Value | Sequoia |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value of loans | 930,027 |  | $ 1,021,870
Residential Loans | FHLB Chicago |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loans pledged as collateral under borrowing agreement with FHLBC | $ 2,340,000 |  |
Originated Between 2013 and 2016 | Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Percentage of loan portfolio originated in year | 93.00% |  |
Originated 2012 and prior years | Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Percentage of loan portfolio originated in year | 7.00% |  |

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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