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Subsequent Events - Additional Information (Details) $ in Thousands			1 Months Ended	9 Months Ended
	Nov. 02, 2020 USD ($)	Oct. 30, 2020 USD ($)	Oct. 31, 2020 USD ($) loan Aqreement Store	Sep. 30, 2020 USD ($) Aqreement	Dec. 31, 2019 USD ($)	May 01, 2017 USD ($)
Subsequent Event [Line Items]
Core portfolio annualized base rents for stores of bankruptcies percentage				1.90%
Fund mortgages aggregate outstanding balances				$ 134,798	$ 114,943
Principal reductions aggregate amount				4,200
Notes receivable				$ 135,708	114,943
Fund II
Subsequent Event [Line Items]
Maturity date				Dec. 07, 2020
Core Portfolio
Subsequent Event [Line Items]
Notes receivable				$ 96,794	76,467
Core Portfolio | Brandywine Portfolio
Subsequent Event [Line Items]
Fund mortgages aggregate outstanding balances						$ 153,400
Notes receivable				38,700	38,700
Fund Portfolio | Fund II
Subsequent Event [Line Items]
Notes receivable				$ 33,608	$ 33,170
COVID-19
Subsequent Event [Line Items]
Number of rent concession agreements | Aqreement				237
Number of rent concession agreements for rent deferral | Aqreement				210
Subsequent Event | Fund II
Subsequent Event [Line Items]
Notes receivable	$ 33,600
Maturity date	Apr. 15, 2021
Notes receivable modifications, reduction in outstanding balance	$ 10,000
Subsequent Event | Brandywine Portfolio
Subsequent Event [Line Items]
Gain (loss) on litigation settlement		$ 30,000
Subsequent Event | Fund IV | Consolidated Properties
Subsequent Event [Line Items]
Number of mortgage loans modified | loan			2
Fund mortgages aggregate outstanding balances			$ 96,200
Principal reductions aggregate amount			$ 8,200
Subsequent Event | Fund IV | Unconsolidated Properties
Subsequent Event [Line Items]
Number of mortgage loans modified | loan			1
Fund mortgages aggregate outstanding balances			$ 15,300
Subsequent Event | Fund IV | Minimum | Unconsolidated Properties
Subsequent Event [Line Items]
Maturity period			1 year
Subsequent Event | Fund IV | Maximum | Unconsolidated Properties
Subsequent Event [Line Items]
Maturity period			2 years
Subsequent Event | COVID-19
Subsequent Event [Line Items]
Number of rent concession agreements | Aqreement			18
Number of rent concession agreements for rent deferral | Aqreement			9
Number of rent concession agreements for rent forgiveness | Aqreement			9
Rent concession aggregate amount			$ 1,400
Subsequent Event | COVID-19 | Core Portfolio
Subsequent Event [Line Items]
Number of stores | Store			6
Annual base rent amount			$ 2,600
Core portfolio annualized base rents for stores of bankruptcies percentage			1.90%
Subsequent Event | COVID-19 | Fund Portfolio
Subsequent Event [Line Items]
Number of stores | Store			17
Annual base rent amount			$ 1,100
Core portfolio annualized base rents for stores of bankruptcies percentage			5.20%

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