Accounting Policies and Related Matters - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) Segment Lease Building	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounting Policies And Related Matters [Line Items]
Number of reportable segments | Segment	1
Allowance for doubtful accounts	$ 0	$ 0
Allowance for loan losses	0	0
Intangible lease assets	11,387,000	11,387,000
Accumulated other comprehensive income	2,211,000	1,247,000
Increase in the beginning of period cash, cash equivalents and restricted cash	(4,270,000)	2,869,000	$ (2,849,000)
Increase (decrease) in the change in other assets	7,210,000	(10,264,000)	12,939,000
Operating liabilities	$ 3,200,000
Number of leases | Lease	2
Number of medical office building | Building	1
Accounting Standards Update 2016-18
Accounting Policies And Related Matters [Line Items]
Increase in the beginning of period cash, cash equivalents and restricted cash		300,000	100,000
Increase (decrease) in the change in other assets		(300,000)	100,000
Above Market Leases
Accounting Policies And Related Matters [Line Items]
Intangible lease assets	$ 7,636,000	7,636,000
Above Market Leases | Real Estate
Accounting Policies And Related Matters [Line Items]
Intangible lease assets	7,600,000	7,600,000
Medical Office Building
Accounting Policies And Related Matters [Line Items]
Operating expense recoveries	$ 200,000	$ 1,000,000	$ 900,000
Ground Lease
Accounting Policies And Related Matters [Line Items]
Number of leases | Lease	1
Corporate Office Lease
Accounting Policies And Related Matters [Line Items]
Number of leases | Lease	1