Relationship with Universal Health Services, Inc. ("UHS") and Related Party Transactions - Additional Information (Detail)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
		Aug. 31, 2019 USD ($) Time	Jun. 30, 2019 USD ($) Property Time Lease	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Property Time Lease	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Remaining lease terms on ground leases			58 years 9 months 18 days		58 years 9 months 18 days
Aggregate lease payments for 2019	[1]		$ 238,000		$ 238,000
Aggregate lease payments for 2020			475,000		475,000		$ 474,000
Aggregate lease payments for 2021			475,000		475,000		474,000
Aggregate lease payments for 2022			475,000		475,000		474,000
Aggregate lease payments for 2023			475,000		475,000		474,000
Aggregate lease payments for thereafter			$ 25,640,000		$ 25,640,000		$ 25,582,000
Annual advisory fee as percentage of average invested real estate assets			0.70%	0.70%	0.70%	0.70%
Universal Health Services, Inc
Related Party Transaction [Line Items]
Number of term renewal options | Time			6		6
Additional renewal terms					5 years
Number of medical office buildings and free standing emergency departments | Property					17
Option to renew lease, notice period prior to termination date of current term					90 days
Period to purchase respective leased facilities at same price after lease terms					180 days
Renewal period of respective leased facilities at same price after lease terms					180 days
Number of renewal options at existing lease rates | Time					3
Number of ground leases | Lease			9		9
Aggregate lease payments for 2019			$ 290,000		$ 290,000
Aggregate lease payments for 2020			290,000		290,000
Aggregate lease payments for 2021			290,000		290,000
Aggregate lease payments for 2022			290,000		290,000
Aggregate lease payments for 2023			290,000		290,000
Aggregate lease payments for thereafter			$ 16,400,000		$ 16,400,000
Percentage ownership of outstanding shares			5.70%		5.70%		5.70%
Universal Health Services, Inc | Customer Concentration Risk | Revenues
Related Party Transaction [Line Items]
Percentage of revenues generated from leases and tenants			21.00%	20.00%	22.00%	21.00%
Universal Health Services, Inc | Customer Concentration Risk | Revenues | Tenants
Related Party Transaction [Line Items]
Percentage of revenues generated from leases and tenants			30.00%	28.00%	31.00%	30.00%
Universal Health Services, Inc | Hospital Facilities Leased
Related Party Transaction [Line Items]
Number of hospital facilities leased | Property			3		3
Universal Health Services, Inc | Minimum
Related Party Transaction [Line Items]
Initial lease terms					13 years
Remaining lease terms on ground leases			30 years		30 years
Universal Health Services, Inc | Maximum
Related Party Transaction [Line Items]
Initial lease terms					15 years
Remaining lease terms on ground leases			79 years		79 years
Universal Health Services, Inc and Catholic Health Initiatives | Scenario Forecast
Related Party Transaction [Line Items]
Number of term renewal options | Time		5
Percentage of hospital preleased		100.00%
Triple net lease agreement period		20 years
Renewal option term		10 years
Project manager's aggregate fee		$ 750,000
Estimated approximate project cost		37,500,000
Estimated initial annual rent		$ 2,700,000
Universal Health Services of Delaware Inc
Related Party Transaction [Line Items]
Annual incentive fee to Advisor as percentage of cash available for distribution							20.00%
Incentive fees							$ 0
Advisory fee			$ 982,000	$ 948,000	$ 2,000,000.0	$ 1,900,000
Type of Cost, Good or Service [Extensible List]			us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Average invested real estate assets			$ 561,000,000	$ 542,000,000	$ 558,000,000	$ 529,000,000
Universal Health Services of Delaware Inc | Minimum
Related Party Transaction [Line Items]
Percentage of equity to be exceeded for incentive distribution							15.00%

[1] Represents the remaining six months of 2019.