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Investments in Real Estate Ventures at Fair Value - Additional Information (Detail) - USD ($)	5 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 30, 2019	Jul. 23, 2019
Schedule Of Equity Method Investments [Line Items]
Fair value of investment	$ 8,421,000	$ 8,421,000	$ 0		$ 9,306,000
Distribution from equity method investment	1,525,000
Recognized loss in fair value due to lower estimated cash flows	560,000	560,000	$ 0
Cash invested	1,200,000
Investor's X [Member]
Schedule Of Equity Method Investments [Line Items]
Fair value of investment	$ 7,200,000	7,200,000			$ 9,300,000
Distribution from equity method investment		1,500,000
Recognized loss in fair value due to lower estimated cash flows		560,000
The Hartford [Member]
Schedule Of Equity Method Investments [Line Items]
Fair value of investment				$ 1,200,000
Distribution from equity method investment		0
Recognized loss in fair value due to lower estimated cash flows		0
Cash invested		$ 1,200,000

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