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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights income (loss), net | $ 3,549 | $ 5,821 | $ (6,545) | $ 4,650
Total Market gains and losses, net | (19,067) | 15,117 | (40,546) | 1,787
Mortgage banking and investment activities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | (14,122) | 12,796 | (9,945) | 7,731
Mortgage banking and investment activities | Residential Loans at Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | 11,010 | 13,489 | 9,892 | 34,608
Mortgage banking and investment activities | Consolidated Sequoia entities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | (500) | (361) | (2,277) | (825)
Mortgage banking and investment activities | Residential Loans Held for Investment |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | 9,077 | (991) | 5,170 | (991)
Mortgage banking and investment activities | Commercial Loans at Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | 3,974 | 4,305 | 10,819 | 13,644
Mortgage banking and investment activities | Trading securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | (8,783) | (1,909) | (15,946) | (15,072)
Mortgage banking and investment activities | Risk managment derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | (52,749) | (4,036) | (60,060) | (29,145)
Mortgage banking and investment activities | Impairments on AFS securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | (226) | (188) | (226) | (565)
Mortgage banking and investment activities | Guarantee asset |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | (1,297) | 0 | (2,081) | 0
Mortgage banking and investment activities | Loan Purchase and Forward Sales Commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | 25,173 | 2,487 | 44,482 | 6,077
Mortgage banking and investment activities | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Market valuations gains and losses, net | 199 | 0 | 282 | 0
MSR Income (loss), net, including risk management derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights income (loss), net | (4,945) | 2,321 | (30,601) | (5,944)
MSR Income (loss), net, including risk management derivatives | Risk managment derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights income (loss), net | 23,551 | 0 | 1,736 | 0
MSR Income (loss), net, including risk management derivatives | Mortgage servicing rights |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights income (loss), net | $ (28,496) | $ 2,321 | $ (32,337) | $ (5,944)

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- Definition The aggregate net change in market value for certain assets and liabilities that was included in earnings for the period. This includes changes in market values for assets and liabilities accounted for at fair value, as well as the credit portion of other-than-temporary impairments on securities available for sale, impairments on loans held-for-sale and real estate owned. + References No definition available. + Details
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