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Asset-Backed Securities Issued - Summary of Carrying Value Components of Collateral for Asset-Backed Securities Issued and Outstanding (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 1,102,195 | $ 1,195,574
Residential Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 930,027 | 1,021,870
Commercial Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 164,626 | 166,016
Restricted Cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 283 | 365
Accrued Interest Receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,328 | 2,428
REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,931 | 4,895
Sequoia |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 936,096 | 1,028,124
Sequoia | Residential Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 930,027 | 1,021,870
Sequoia | Commercial Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Sequoia | Restricted Cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 147 | 228
Sequoia | Accrued Interest Receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,038 | 1,131
Sequoia | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,884 | 4,895
Commercial Securitization |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 166,099 | 167,450
Commercial Securitization | Residential Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 0 | 0
Commercial Securitization | Commercial Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 164,626 | 166,016
Commercial Securitization | Restricted Cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 136 | 137
Commercial Securitization | Accrued Interest Receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,290 | 1,297
Commercial Securitization | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 47 | $ 0

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