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Other Investments - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) investment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) partnership | Dec. 31, 2018 partnership
Investment [Line Items] |  |  |  |  |
Number of partnerships consolidated | partnership |  |  |  | 2 | 2
Commitment to fund partnership |  | $ 148,000 |  |  |
Collateral amounts |  | 1,306,932 | $ 1,084,929 |  |
Investment fair value changes, net |  | 128,049 | (588,438) | $ 35,500 |
Interest income |  | 574,926 | 571,916 | 622,281 |
Other income, net |  | 12,018 | 4,188 | 19,257 |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment fair value changes, net |  | 90,121 | (167,856) |  |
Estimated fair value of investments |  | 1,033,913 | 789,228 |  |
Interest income |  | 400,292 | 391,191 |  |
Variable Interest Entity, Primary Beneficiary | Collateralized Financing Entities | Point |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Estimated fair value of investments | $ 10,000 |  |  |  |
MSRs |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Servicing asset, fair value |  | 12,438 | 8,815 |  |
Servicing assets |  | 2,120,000 | 2,590,000 |  |
MSR income (loss) |  | 2,000 | (10,000) | 4,000 |
HEIs |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investments acquired |  | 78,000 |  |  |
Transfer to investments | 172,000 |  |  |  |
HEIs | Redwood |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Servicing asset, fair value |  | 33,000 |  |  |
HEIs | Point HEI |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Servicing asset, fair value |  | 160,000 |  |  |
Strategic Investments |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Other income, net |  | $ 800 |  |  |
Strategic Investments | RWT Horizons |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Number of investments made | investment |  | 15 |  |  |
Investments |  | $ 21,000 |  |  |
Strategic Investments | Churchill Finance |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Number of investments made | investment |  | 1 |  |  |
Commitment To Fund Investment | Shared home appreciation options |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment fair value changes, net |  | $ 13,000 | (2,000) |  |
Residential Loans |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Servicing asset, fair value |  | 350,923 | 231,489 |  |
Servicing asset, unpaid principal balance on underlying loan |  | 13,630,000 |  |  |
Excess MSRs |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Servicing asset, fair value |  | 44,231 | 34,418 |  |
Investment fair value changes, net |  | (8,000) | (8,000) | (3,000) |
Fair value option elected aggregate carrying amount, asset |  | 18,000 | 11,000 |  |
Interest income |  | 13,000 | 12,000 | 8,000 |
HEIs |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Fair value option elected aggregate carrying amount, asset | 122,000 |  |  |  |
Other investments held by noncontrolling interests | 17,000 |  |  |  |
Point HEI |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment fair value changes, net |  | 200 |  |  |
Other investments, interest expense |  | 1,400 |  |  |
Point HEI | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Amortized cost | $ 146,000 |  |  |  |
Servicer advance financing |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Collateral amounts |  | 311,000 |  |  |
Income (loss) on investments |  | 12,000 | 11,000 | 11,000 |
Investment fair value changes, net |  | $ (1,000) | $ (9,000) | $ 3,000 |

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