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Notes Receivable, Net - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest	$ 11,181,000	$ 9,872,000
Notes receivable, net	173,159,000	114,943,000
Additional credit loss reserve	500,000
Credit loss reserves	930,000
Credit loss reserves	173,159,000	114,943,000
Core Portfolio
Accounts Notes And Loans Receivable [Line Items]
Notes receivable modified, subsequent payment default		20,800
Proceeds from notes receivable		4,300,000
Notes receivable defer interest until maturity		$ 400,000
Structured Financing
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest	5,200,000
Loans amortized cost	0
Credit loss reserves	95,000,000.0
Structured Financing | Non-Collateral Dependent Loans
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest	6,000,000.0
Loans amortized cost	90,300,000
Credit loss reserves	900,000
ASU 2016-13
Accounts Notes And Loans Receivable [Line Items]
Credit loss reserve	400,000
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	$ 21,000,000.0
850 Third Avenue Brooklyn, NY
Accounts Notes And Loans Receivable [Line Items]
Notes receivable, net	$ 54,000,000.0
Interest Rate	9.00%
Pacesetter Park
Accounts Notes And Loans Receivable [Line Items]
Interest Rate		5.10%
Note receivable exchanged for sale of real estate		$ 13,500,000
Fund II
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest	$ 100,000	400,000
Fund IV
Accounts Notes And Loans Receivable [Line Items]
Proceeds from notes receivable		15,300,000
Note receivable accrued interest		10,000,000.0
Fund III
Accounts Notes And Loans Receivable [Line Items]
Note receivable accrued interest		$ 4,700,000

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