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Residential Loans - Summary of Classifications and Carrying Value of Residential Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | $ 4,036,674 | $ 3,398,573
Residential Loans at Fair Value | Conforming Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 236,314 | 244,714
Residential Loans at Fair Value | Jumbo Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 1,268,391 | 1,096,317
Residential Loans at Lower of Cost or Fair Value |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 1,446 | 1,488
Residential Loans Held For Investment at Fair Value | Jumbo Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 2,530,523 | 581,668
Residential Loans Held For Investment At Amortized Cost |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans |  | 1,474,386
Redwood |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 2,866,428 | 1,924,187
Redwood | Residential Loans at Fair Value | Conforming Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 236,314 | 244,714
Redwood | Residential Loans at Fair Value | Jumbo Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 1,268,391 | 1,096,317
Redwood | Residential Loans at Lower of Cost or Fair Value |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 1,446 | 1,488
Redwood | Residential Loans Held For Investment at Fair Value | Jumbo Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 1,360,277 | 581,668
Redwood | Residential Loans Held For Investment At Amortized Cost |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans |  | 0
Sequoia |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 1,170,246 | 1,474,386
Sequoia | Residential Loans at Fair Value | Conforming Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 0 | 0
Sequoia | Residential Loans at Fair Value | Jumbo Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 0 | 0
Sequoia | Residential Loans at Lower of Cost or Fair Value |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 0 | 0
Sequoia | Residential Loans Held For Investment at Fair Value | Jumbo Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | $ 1,170,246 | 0
Sequoia | Residential Loans Held For Investment At Amortized Cost |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans |  | $ 1,474,386

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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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