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Other Investments - Additional Information (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jan. 31, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Commitment to fund partnership | $ 94,000 |  |  |  |  |  |  |
Servicing asset, fair value | 249,705 |  | $ 249,705 |  |  | $ 249,705 |  | $ 151,582
Equity investment (loss) income |  |  | (574) |  | $ (96) | 274 | $ 172 |
Investment fair value changes, net |  |  | 152,228 |  | 3,138 | (718,604) | 23,297 |
Interest income |  |  | 129,946 |  | 148,542 | 328,027 | 279,583 |
Servicer advance financing |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Collateral amounts | 250,000 |  | 250,000 |  |  | 250,000 |  |
Equity investment (loss) income |  |  | 3,000 |  | 3,000 | 6,000 | 5,000 |
Investment fair value changes, net |  |  | (100) |  | 400 | (6,000) | 1,000 |
Residential Loans |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Servicing asset, fair value | 266,948 |  | 266,948 |  |  | 266,948 |  | 169,204
Servicing asset, unpaid principal balance on underlying loan | 10,260,000 |  | 10,260,000 |  |  | 10,260,000 |  |
Excess MSRs |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Servicing asset, fair value | 36,197 |  | 36,197 |  |  | 36,197 |  | 31,814
Investment fair value changes, net |  |  | 3,000 |  | (100) | (7,000) | (500) |
Interest income |  |  | 3,000 |  | 2,000 | 6,000 | 4,000 |
Light-Renovation Multifamily Loans |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Commitment to fund partnership |  | $ 78,000 |  |  |  |  |  |
Equity investment (loss) income |  |  | (1,000) |  | (100) | 300 | (100) |
Commitment to fund partnership, funded amount | 70,000 |  | 70,000 |  |  | 70,000 |  |
Securities acquired from first securitization transaction |  |  |  | $ 28,000 |  |  |  |
Carrying amount of investment in partnership | 30,000 |  | 30,000 |  |  | 30,000 |  |
MSRs |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Servicing asset, fair value | 19,661 |  | 19,661 |  |  | 19,661 |  | 42,224
Servicing asset | 3,630,000 |  | 3,630,000 |  |  | 3,630,000 |  | $ 4,350,000
MSR income, net |  |  | (1,000) |  | $ 2,000 | (3,000) | $ 2,000 |
Shared home appreciation options |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Investment fair value changes, net |  |  | 1,000 |  |  | (7,000) |  |
Payments to acquire investments | 47,000 |  |  |  |  |  |  |
Shared home appreciation options | Commitment To Fund Investment |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Commitment to fund loan | $ 3,000 |  | $ 3,000 |  |  | $ 3,000 |  |

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