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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) Investment | Dec. 31, 2014 USD ($)
Variable Interest Entity [Line Items] |  |
Assets | $ 1,622,636 | $ 1,900,208
Liabilities | $ 1,263,249 | $ 1,546,490
Number of VIEs | Investment | 26 |
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,243,259 |
Liabilities | $ 1,174,133 |
Number of VIEs | Investment | 24 |
Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 195,687 |
Liabilities | $ 18,874 |
Number of VIEs | Investment | 1 |
Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 183,690 |
Liabilities | $ 70,242 |
Number of VIEs | Investment | 1 |
Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,237,114 |
Residential Loans Held for Investment | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,237,114 |
Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 182,184 |
Commercial Loans Held For Investment | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 182,184 |
Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 195,278 |
Real Estate Securities | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 195,278 |
Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 286 |
Restricted Cash | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 147 |
Restricted Cash | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Restricted Cash | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 139 |
Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,365 |
Accrued Interest Receivable | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,589 |
Accrued Interest Receivable | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 409 |
Accrued Interest Receivable | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,367 |
Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,409 |
Other Assets | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,409 |
Other Assets | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 |
Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,127 |
Accrued Interest Payable | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 797 |
Accrued Interest Payable | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 2 |
Accrued Interest Payable | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 328 |
Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,262,122 |
Asset-backed Securities | Sequoia |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,173,336 |
Asset-backed Securities | Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 18,872 |
Asset-backed Securities | Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 69,914 |

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