Disposition Investments in Real Estate (Detail) - Summary Of The Results Of Operations Related To The Assets Held For Sale - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 3,510,000	$ 6,081,000	$ 12,523,000	$ 16,882,000
Expenses	10,834,000	8,435,000	27,173,000	51,183,000
Income/(Loss) from assets held for sale, net of income taxes	(7,324,000)	(2,354,000)	(14,650,000)	(34,301,000)
Real Estate [Member] | San Jose 88 Garage, LLC [Member]
Revenue		113,000	113,000	338,000
Expenses		102,000	191,000	705,000
Income/(Loss) from assets held for sale, net of income taxes		$ 11,000	$ (78,000)	$ (367,000)