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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) Investment | Dec. 31, 2014 USD ($)
Variable Interest Entity [Line Items] |  |
Assets | $ 1,539,350 | $ 1,900,208
Liabilities | $ 1,179,884 | $ 1,546,490
Number of VIEs | Investment | 26 |
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,175,844 |
Liabilities | $ 1,106,358 |
Number of VIEs | Investment | 24 |
Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 181,617 |
Liabilities | $ 5,262 |
Number of VIEs | Investment | 1 |
Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 181,889 |
Liabilities | $ 68,264 |
Number of VIEs | Investment | 1 |
Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,170,246 |
Residential Loans Held for Investment | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,170,246 |
Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 180,394 |
Commercial Loans Held For Investment | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 180,394 |
Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 181,253 |
Real Estate Securities | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 181,253 |
Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 329 |
Restricted Cash | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 191 |
Restricted Cash | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Restricted Cash | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 138 |
Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,226 |
Accrued Interest Receivable | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,505 |
Accrued Interest Receivable | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 364 |
Accrued Interest Receivable | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,357 |
Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,902 |
Other Assets | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,902 |
Other Assets | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,089 |
Accrued Interest Payable | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 770 |
Accrued Interest Payable | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1 |
Accrued Interest Payable | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 318 |
Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,178,795 |
Asset-backed Securities | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,105,588 |
Asset-backed Securities | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 5,261 |
Asset-backed Securities | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 67,946 |

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