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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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