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Long-Term Debt - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Aug. 31, 2017 USD ($) | Jun. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 | Mar. 31, 2020 | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | $ 1,689,670,000 | $ 1,746,145,000 |
Long-term debt |  |  |  |  |  |  |  | 1,680,901,000 | 1,733,425,000 |
Non-Recourse BPL Financing |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | 1,182,594,000 | 1,079,353,000 |
Long-term debt |  |  |  |  |  |  |  | 1,180,918,000 | 1,077,200,000 |
Convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | $ 215,000,000 |  |  |  |  |
Trust preferred securities |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | 100,000,000 |  |
Subordinated Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | 40,000,000 |  |
Recourse Subordinate Securities Financing Receivable | HEI at Redwood |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  |  |  |  |  | 4.21% |  |  |
Recourse Subordinate Securities Financing Receivable | HEI at Redwood | Net investments in consolidated CAFL Term entities | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  |  |  |  | 4.75% |  |  |  | 4.21%
Recourse Subordinate Securities Financing Receivable | HEI at Redwood | October 2022 through September 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  |  |  |  |  | 5.71% |  |  |
Recourse Subordinate Securities Financing Receivable | HEI at Redwood | October 2023 through September 2024 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  |  |  |  |  | 7.21% |  |  |
Recourse Subordinate Securities Financing Receivable | HEI at Redwood | March 2023 through February 2024 | Net investments in consolidated CAFL Term entities | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  |  |  |  |  |  |  |  | 5.71%
Recourse Subordinate Securities Financing Receivable | HEI at Redwood | March 2024 through February 2025 | Net investments in consolidated CAFL Term entities | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  |  |  |  |  |  |  |  | 7.21%
Recourse Subordinate Securities Financing Receivable | HEI at Redwood | July 2024 through June 2025 | Net investments in consolidated CAFL Term entities | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  |  |  |  | 6.25% |  |  |  |
Recourse Subordinate Securities Financing Receivable | HEI at Redwood | July 2025 to June 2026 | Net investments in consolidated CAFL Term entities | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  |  |  |  | 7.75% |  |  |  |
Facility E |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Limit |  |  |  |  |  |  |  | 335,000,000 |  |
Committed line of credit |  |  |  |  |  |  |  | 100,000,000 |  |
Facility E | Non-Recourse BPL Financing |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Limit |  |  |  |  |  |  |  | 100,000,000 | 335,000,000 |
Borrowings |  |  |  |  |  |  |  | 70,858,000 | 308,933,000 |
Long-term debt |  |  |  |  |  |  |  | $ 70,108,000 | 308,095,000 |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  | 3.25% |  |
7.75% convertible senior notes | Convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | $ 210,910,000 | $ 215,000,000 |
Debt instrument, interest rate (as a percent) |  |  |  |  | 7.75% |  |  |  | 7.75% |
Range of weighted average interest rates, by series (as a percent) |  |  |  |  | 8.50% |  |  |  |  |
Convertible debt, conversion ratio |  |  |  |  | 0.0956823 |  |  |  |  |
Convertible senior notes conversion per share (in dollars per share) | $ / shares |  |  |  |  | $ 10.45 |  |  |  |  |
Net proceeds from issuance of convertible debt |  |  |  |  | $ 208,000,000 |  |  |  |  |
Repurchased debt instrument, face amount |  |  |  |  |  |  |  | 4,000,000 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | 300,000 |  |
Long-term debt |  |  |  |  |  |  |  | 206,032,000 | $ 208,858,000 |
5.75% exchangeable senior notes | Convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | $ 156,666,000 | $ 162,092,000 |
Debt instrument, interest rate (as a percent) |  | 5.75% |  |  |  |  |  | 5.75% | 5.75% |
Convertible debt, conversion ratio | 0.0552644 |  |  |  |  |  |  |  |  |
Convertible senior notes conversion per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 18.09 |  |
Debt instrument, face amount |  | $ 201,000,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of convertible debt |  | $ 195,000,000 |  |  |  |  |  |  |  |
Interest expense yield |  | 6.30% |  |  |  |  |  |  |  |
Repurchased debt instrument, face amount |  |  |  |  |  |  |  | $ 5,000,000 | $ 10,000,000 |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | 300,000 | 2,000,000 |
Long-term debt |  |  |  |  |  |  |  | 155,138,000 | 159,682,000 |
Convertible Senior Notes Due 2023 | Convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchased debt instrument, face amount |  |  |  |  |  |  |  | 64,000,000 | 22,000,000 |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | 200,000 | $ 400,000 |
Convertible Senior Notes Due 2023 | Convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  | 4.75% |  |  |  |  | 4.75% |
Debt instrument, face amount |  |  |  | $ 245,000,000 |  |  |  |  |  |
Interest expense yield |  |  |  | 5.30% |  |  |  |  |  |
5.625% exchangeable senior notes | Convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchased debt instrument, face amount |  |  |  |  |  |  |  | 7,000,000 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | $ 100,000 |  |
5.625% exchangeable senior notes | Convertible notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  | $ 150,200,000 |
Debt instrument, interest rate (as a percent) |  |  | 5.625% |  |  | 5.625% |  | 5.625% | 5.625% |
Convertible debt, conversion ratio |  |  | 0.0548317 |  |  |  |  |  |  |
Convertible senior notes conversion per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 18.24 |  |
Debt instrument, face amount |  |  | $ 200,000,000 |  |  |  |  |  |  |
Net proceeds from issuance of convertible debt |  |  | $ 194,000,000 |  |  |  |  |  |  |
Interest expense yield |  |  | 6.20% |  |  |  |  |  |  |
Percent of par at issuance |  |  | 99.50% |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 148,918,000 |

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