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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) Investment | Dec. 31, 2015 USD ($) Investment
Variable Interest Entity [Line Items] |  |
Assets | $ 1,102,195 | $ 1,195,574
Liabilities | $ 959,464 | $ 1,050,861
Number of VIEs | Investment | 21 | 22
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 936,096 | $ 1,028,124
Liabilities | $ 907,542 | $ 997,475
Number of VIEs | Investment | 20 | 21
Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 166,099 | $ 167,450
Liabilities | $ 51,922 | $ 53,386
Number of VIEs | Investment | 1 | 1
Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 930,027 | $ 1,021,870
Residential Loans Held for Investment | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 930,027 | 1,021,870
Residential Loans Held for Investment | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 164,626 | 166,016
Commercial Loans Held For Investment | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 0
Commercial Loans Held For Investment | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 164,626 | 166,016
Real estate securities |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 0
Real estate securities | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 0
Real estate securities | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets |  | 0
Restricted cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 283 | 365
Restricted cash | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 147 | 228
Restricted cash | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 136 | 137
Accrued interest receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,328 | 2,428
Accrued interest receivable | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,038 | 1,131
Accrued interest receivable | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,290 | 1,297
Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,931 | 4,895
Other Assets | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,884 | 4,895
Other Assets | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 47 | 0
Accrued interest payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 761 | 804
Accrued interest payable | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 519 | 555
Accrued interest payable | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 242 | 249
Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 100
Accrued expenses and other liabilities | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 100
Accrued expenses and other liabilities | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities |  | 0
Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 958,703 | 1,049,957
Asset-backed Securities | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 907,023 | 996,820
Asset-backed Securities | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 51,680 | $ 53,137

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