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Notes Receivable, Net - Additional Information (Details) - USD ($)		3 Months Ended	12 Months Ended
	Feb. 01, 2020	Mar. 31, 2021	Dec. 31, 2020	Nov. 02, 2020	Nov. 01, 2020	Apr. 01, 2020	Jan. 14, 2020
Accounts Notes And Loans Receivable [Line Items]
Increase in allowance for credit loss		$ 100,000
Notes receivable		102,100,000	$ 102,100,000
Note receivable accrued interest		15,481,000	13,917,000
Credit loss reserve		690,000	650,000
Notes receivable, net		101,410,000	101,450,000
Additional credit loss reserve			300,000
Aggregate loans		101,410,000	101,450,000
LUF Portfolio
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest	$ 5,000,000.0
Interest Rate	8.00%
Percentage of mortgage loan collateralized	50.00%
Core Note
Accounts Notes And Loans Receivable [Line Items]
Notes receivable modified, subsequent payment default		21,600,000	21,600,000
850 Third Avenue Brooklyn, NY
Accounts Notes And Loans Receivable [Line Items]
Notes receivable, net							$ 54,000,000.0
Interest Rate							9.00%
Fund II
Accounts Notes And Loans Receivable [Line Items]
Notes receivable				$ 33,800,000
Note receivable accrued interest					$ 600,000
Notes receivable, net			33,800,000
Fund III
Accounts Notes And Loans Receivable [Line Items]
Notes receivable modified, subsequent payment default		10,000,000.0
ASU 2016-13
Accounts Notes And Loans Receivable [Line Items]
Credit loss reserve			400,000
Core Portfolio
Accounts Notes And Loans Receivable [Line Items]
Notes receivable		96,794,000	$ 96,794,000
Structured Financing
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest		8,800,000
Credit loss reserve		0
Aggregate loans		38,400,000
Structured Financing | Non-Collateral Dependent Loans
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest		6,700,000
Credit loss reserve		700,000
Loans amortized cost		$ 79,200,000
Brandywine Portfolio | Core Portfolio
Accounts Notes And Loans Receivable [Line Items]
Notes receivable						$ 38,700,000
Note receivable accrued interest						$ 2,000,000.0
Equity method investment, ownership percentage by third party						24.78%

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