Investments in Debt Securities and Notes Receivable - Additional Information (Details) $ in Thousands	1 Months Ended		9 Months Ended
	Nov. 30, 2020 USD ($) extension_option shares	Jul. 31, 2020 USD ($) facility	Sep. 30, 2021 USD ($) extension_option	Sep. 30, 2020 USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Investment in debt securities	$ 300,000
Debt securities, term	5 years
Debt securities, extension option | extension_option	2
Debt securities, extension term	1 year
Debt securities, period after which preferred dividends increase annually	5 years
Payments for issuance/purchase of notes receivable			$ 143,270	$ 149,750
Bridge loans, extension option | extension_option			2
Bridge loans, extension term			1 year
Proceeds from sale of notes receivable			$ 116,822	$ 0
Notes Receivable-Senior Mezzanine Loan
Schedule of Held-to-maturity Securities [Line Items]
Purchase of note receivable		$ 103,000
Note receivable interest rate		5.50%
Collateral, number of facilities | facility		62
Payments for issuance/purchase of notes receivable		$ 101,142
Notes Receivable-Bridge Loans
Schedule of Held-to-maturity Securities [Line Items]
Bridge loans, original maturities			3 years
Principal amount of notes sold			$ 117,336
Proceeds from sale of notes receivable			$ 116,822
JCAP Series A Preferred Stock
Schedule of Held-to-maturity Securities [Line Items]
Investment in debt securities	$ 200,000
Investment in debt securities (in shares) | shares	200,000
Debt securities, dividend rate	10.00%
JCAP Series B Preferred Stock
Schedule of Held-to-maturity Securities [Line Items]
Investment in debt securities	$ 100,000
Investment in debt securities (in shares) | shares	100,000
Debt securities, dividend rate	12.00%