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Equity Method Investments in Real Estate Ventures at Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Fair value of equity method investment	$ 8,230,000		$ 8,421,000
Distribution from equity method investment	144,000
Recognized income (loss) in fair value due to changes in overall interest rate environment	(47,000)	$ 0
Investor's X [Member]
Schedule Of Equity Method Investments [Line Items]
Fair value of equity method investment	7,000,000		7,200,000
Distribution from equity method investment	144,000
Recognized income (loss) in fair value due to changes in overall interest rate environment	(73,000)
The Hartford [Member]
Schedule Of Equity Method Investments [Line Items]
Fair value of equity method investment	1,200,000		$ 1,200,000
Distribution from equity method investment	0
Recognized income (loss) in fair value due to changes in overall interest rate environment	$ 27,000

X

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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