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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) Investment | Dec. 31, 2014 USD ($) Investment
Variable Interest Entity [Line Items] |  |
Assets | $ 1,195,574 | $ 1,900,208
Liabilities | $ 1,050,861 | $ 1,546,490
Number of VIEs | Investment | 22 | 26
Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,021,870 | $ 1,474,386
Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 166,016 | 194,991
Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 221,676
Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 365 | 327
Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 2,428 | 4,347
Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,895 | 4,481
Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 804 | 1,371
Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 100 |
Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,049,957 | 1,545,119
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,028,124 | 1,481,303
Liabilities | $ 997,475 | $ 1,417,738
Number of VIEs | Investment | 21 | 24
Sequoia | Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 1,021,870 | $ 1,474,386
Sequoia | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 228 | 147
Sequoia | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,131 | 2,359
Sequoia | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 4,895 | 4,411
Sequoia | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 555 | 976
Sequoia | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 100 |
Sequoia | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 996,820 | 1,416,762
Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 222,196
Liabilities | $ 0 | $ 45,049
Number of VIEs | Investment | 0 | 1
Residential Resecuritization | Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 0 | $ 221,676
Residential Resecuritization | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 43
Residential Resecuritization | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 477
Residential Resecuritization | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 5
Residential Resecuritization | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 |
Residential Resecuritization | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 | 45,044
Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 167,450 | 196,709
Liabilities | $ 53,386 | $ 83,703
Number of VIEs | Investment | 1 | 1
Commercial Securitization | Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | $ 166,016 | $ 194,991
Commercial Securitization | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 137 | 137
Commercial Securitization | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,297 | 1,511
Commercial Securitization | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 | 70
Commercial Securitization | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 249 | 390
Commercial Securitization | Accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 0 |
Commercial Securitization | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 53,137 | $ 83,313

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