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Mortgage Banking and Invetsment Activities, Net (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items] |  |  |
Hedging allocation | $ 0 |  |
Total investment activities | (21,357) | $ (10,202) | $ (5,747)
Mortgage banking and investment activities, net | (10,385) | 24,792 | 96,785
Residential Mortgage Banking Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Hedging allocation | 1,120 | 0 | 0
Other income, net | 4,040 | 3,468 | 48
Mortgage banking activities, net | 8,268 | 21,554 | 79,431
Commercial Mortgage Banking Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Net gains on commercial loan sales | 0 | 0 | 11,031
Other income, net | 450 | 541 | 0
Mortgage banking activities, net | 2,704 | 13,440 | 23,101
Investment Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of risk management derivatives | (8,557) | (7,792) | 223
Hedging allocation | (1,120) | 0 | 0
Residential loans at fair value | Residential Mortgage Banking Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of assets | 3,712 | 51,311 | (10,455)
Real estate securities | Residential Mortgage Banking Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of assets | (15,261) | (23,839) | 42,451
Real estate securities | Investment Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of assets | (2,265) | (923) | (5,357)
Risk management derivatives | Residential Mortgage Banking Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of assets | 14,657 | (9,386) | 47,387
Risk management derivatives | Commercial Mortgage Banking Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of risk management derivatives | (8,011) | (7,890) | 3,376
Commercial Loans at Fair Value | Commercial Mortgage Banking Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of assets | 10,265 | 20,789 | 8,694
Residential Loans Held for Investment | Investment Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of assets | (6,337) | (697) | 0
Investments In Consolidated Variable Interest Entity | Investment Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of assets | (1,192) | (894) | (613)
Risk Sharing Investments | Investment Activities |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Changes in fair value of assets | $ (1,886) | $ 104 | $ 0

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- Definition The net income attributable to mortgage banking activities. This includes market valuations related to residential and commercial loans, Sequoia IOs, and mortgage banking derivatives, as well as realized gains or losses associated with mortgage loan sales. + References No definition available. + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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