Commitments and Contingencies - Narrative (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) tenant claim ground_lease	Dec. 31, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Contingently liable amount of debt owed by tenant	$ 5,700,000	$ 5,700,000
Number of tenants indemnified by | tenant	1
Accruals made for environmental remediation	$ 0
Outstanding claims | claim	0
Total commitments	$ 20,400,000
Total commitments relating to future acquisitions	7,300,000
Commitments to purchase capital assets within one year expected to be funded within one year	$ 18,900,000
Operating lease renewal option	two
Operating lease renewal term	5 years
Number of long-term non-cancelable ground leases | ground_lease	5
Operating lease, weighted average remaining lease term	7 years 3 months 18 days
Operating lease, right-of-use assets	$ 5,300,000
Operating lease liabilities	$ 7,200,000