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Principles of Consolidation - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended | 93 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) partnership | Dec. 31, 2018 USD ($) partnership | Sep. 30, 2019 USD ($) entity
Variable Interest Entity [Line Items] |  |  |  |
Number of partnerships consolidated | partnership |  | 2 | 2 |
MSRs | $ 204,946 | $ 286,778 | $ 286,778 | $ 204,946
Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE, ownership interest rate |  | 80.00% |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of securitization entities to which asset transferred (in entities) | entity |  |  |  | 46
Gain (loss) on securitization of financial assets | 4,000 |  |  |
Loan acquisition, aggregate amount acquired | 39,000 |  |  |
Legacy Sequoia | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Estimated fair value of investments | 10,000 |  |  | $ 10,000
Sequoia Choice | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Estimated fair value of investments | 259,000 |  |  | 259,000
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Estimated fair value of investments | 456,000 |  |  | 456,000
Freddie Mac K-Series | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Estimated fair value of investments | 215,000 |  |  | 215,000
Servicing Investment | Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
MSRs | $ 75,000 |  |  | $ 75,000

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