Leases - Summary of Fixed and Variable Components of Operating Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Fixed ground rent expense	$ 1,014	$ 359	$ 2,026	$ 718
Variable ground rent expense	1	3	18	21
Total cash portion of ground rent expense	1,015	362	2,044	739
Non-cash ground rent expense	1,691	1,092	3,434	2,184
Total operating lease costs	$ 2,706	$ 1,454	$ 5,478	$ 2,923