Investments in Real Estate - Summary of Assets and Liabilities of Properties Classified as Held for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Investments in real estate, net	$ 36,877	$ 141,344
Other assets	267	2,035
Total assets	37,144	143,379
Liabilities:
Mortgage notes	27,112	104,314
Other liabilities	1,086	4,097
Total liabilities	$ 28,198	$ 108,411