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Equity Method Investments in Real Estate Ventures at Fair Value - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Dec. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Fair value of equity method investment		$ 6,965		$ 6,965		$ 8,421
Distributions				1,322	$ 100
Change in fair value of equity method investment		46	$ 606	134	$ 606
Level 3
Schedule of Equity Method Investments [Line Items]
Fair value of equity method investment		6,965		6,965		8,421
Distributions				1,322
Change in fair value of equity method investment				(134)
Investors X
Schedule of Equity Method Investments [Line Items]
Fair value of equity method investment		5,800		5,800		7,200
Distributions		581		1,239
Change in fair value of equity method investment		(47)		(161)
The Hartford
Schedule of Equity Method Investments [Line Items]
Fair value of equity method investment		1,100		1,100		$ 1,100
Distributions		$ 24		$ 83
Percentage of ownership interest	2.50%
Equity method investment cost	$ 1,200

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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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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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