Revenue Recognition - Schedule of Fee and Other Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customers	$ 9,100	$ 11,945	$ 32,466	$ 42,928
Other property income:
Other	580	1,635	3,487	5,836
Total fee and other income	9,680	13,580	35,953	48,764
Asset and Property Management Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customers	7,326	9,751	24,201	32,392
Leasing Commissions [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customers	648	1,036	4,327	3,916
Development Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customers	210	552	1,256	1,497
Disposition Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customers	856	546	2,622	3,263
Credit Facility Guaranty and Refinancing Fees [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customers	$ 60	$ 60	$ 60	$ 1,860