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Other Investments - Additional Information (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Jan. 31, 2019 | May 31, 2018 | Feb. 28, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to fund partnership | $ 71,000 |  |  |  |  |  |  |  |  |  |  |  |
Servicing asset, fair value | 204,946 |  |  |  |  | $ 204,946 |  | $ 204,946 |  |  | $ 286,778 |  |
Equity method investment earnings |  |  |  |  |  | 3,000 |  | 9,000 |  |  |  |  |
Investment fair value changes, net |  |  |  |  |  | 11,444 | $ 10,332 | 34,741 | $ 12,830 |  |  |  |
Interest income |  |  |  |  |  | 150,117 | 99,397 | 429,700 | 258,992 |  |  |  |
Equity investment income |  |  |  |  |  | 557 | 119 | 552 | 119 |  |  |  |
Light-Renovation Multifamily Loans |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to fund partnership |  |  | $ 78,000 |  |  |  |  |  |  |  |  |  |
Commitment to fund partnership, funded amount | 33,000 |  |  |  |  | 33,000 |  | 33,000 |  |  |  |  |
Equity method investments, carrying value | 32,000 |  |  |  |  | 32,000 |  | 32,000 |  |  |  |  |
Equity investment income |  |  |  |  |  | 1,000 |  | (500) |  |  |  |  |
5 Arches, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment earnings |  |  |  |  | $ 300 |  |  |  |  |  |  |  |
Payments to acquire equity method investment |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Option to purchase additional equity, term |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Option to purchase additional equity, amount |  |  |  | $ 40,000 |  |  |  |  |  |  |  |  |
Option to purchase additional equity, percent |  | 80.00% |  |  |  |  |  |  |  |  |  |  |
Amortization of certain intangibles |  |  |  |  | $ 100 |  |  |  |  |  |  |  |
MSRs |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing asset, fair value | 39,837 |  |  |  |  | 39,837 | $ 63,785 | 39,837 | $ 63,785 | $ 47,396 | 60,281 | $ 64,674 | $ 63,598
Servicing asset | 4,610,000 |  |  |  |  | 4,610,000 |  | 4,610,000 |  |  | 4,930,000 |  |
Home appreciation options |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire investments | 11,000 |  |  |  |  |  |  |  |  |  |  |  |
Servicer advance financing |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral amounts | 205,000 |  |  |  |  | 205,000 |  | 205,000 |  |  |  |  |
Investment fair value changes, net |  |  |  |  |  | 2,000 |  | 3,000 |  |  |  |  |
Residential Loans |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing asset, fair value | 222,591 |  |  |  |  | 222,591 |  | 222,591 |  |  | 300,468 |  |
Servicing asset, unpaid principal balance on underlying loan | 8,380,000 |  |  |  |  | 8,380,000 |  | 8,380,000 |  |  |  |  |
Excess MSRs |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing asset, fair value | $ 32,937 |  |  |  |  | 32,937 |  | 32,937 |  |  | $ 27,312 |  |
Investment fair value changes, net |  |  |  |  |  | (2,000) |  | (2,000) |  |  |  |  |
Interest income |  |  |  |  |  | $ 2,000 |  | $ 6,000 |  |  |  |  |
5 Arches, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Minority interest, percentage |  |  |  | 20.00% |  |  |  |  |  |  |  |  |

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