Annual advisory fees as percentage of average invested real estate assets.

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Average invested real estate assets.

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Initial lease expiration period.

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Lease renewal, notice period.

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Number of ground leases.

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Number of leased properties for medical office buildings and free standing emergency departments.

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Number of renewal options.

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Operating leases, number of renewal options at existing lease rates.

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Percentage of cash available in excess of target distribution paid for incentive distributions.

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Percentage of ownership interest related parties.

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Percentage of target distribution must be exceeded by for incentive distributions.

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Period to purchase respective leased facilities after lease terms.

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Renewal option terms additional period.

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Renewal option terms maximum additional period.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount of expense for incentive rights held by the managing member or general partner, of limited liability company (LLC) or limited partnership (LP).

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

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The number of real estate properties owned as of the balance sheet date.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Indicates type of cost of good or service sold.

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Relationship with Universal Health Services, Inc. ("UHS") and Related Party Transactions - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Property Time Lease	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Remaining lease terms on ground leases	59 years
Aggregate lease payments for 2019	$ 356,000
Aggregate lease payments for 2020	475,000		$ 474,000
Aggregate lease payments for 2021	475,000		474,000
Aggregate lease payments for 2022	475,000		474,000
Aggregate lease payments for 2023	475,000		474,000
Aggregate lease payments for thereafter	$ 25,640,000		$ 25,582,000
Annual advisory fee as percentage of average invested real estate assets	0.70%	0.70%
Universal Health Services, Inc
Related Party Transaction [Line Items]
Number of term renewal options \| Time	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
Aggregate lease payments for 2019	$ 281,000
Aggregate lease payments for 2020	281,000
Aggregate lease payments for 2021	281,000
Aggregate lease payments for 2022	281,000
Aggregate lease payments for 2023	281,000
Aggregate lease payments for thereafter	$ 15,900,000
Percentage ownership of outstanding shares	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	22.00%	22.00%
Universal Health Services, Inc \| Customer Concentration Risk \| Revenues \| Tenants
Related Party Transaction [Line Items]
Percentage of revenues generated from leases and tenants	31.00%	31.00%
Universal Health Services, Inc \| Hospital Facilities Leased
Related Party Transaction [Line Items]
Number of hospital facilities leased \| Property	3
Universal Health Services, Inc \| Minimum
Related Party Transaction [Line Items]
Initial lease terms	13 years
Remaining lease terms on ground leases	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
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	$ 970,000	$ 904,000
Type of Cost, Good or Service [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Average invested real estate assets	$ 554,000,000	$ 517,000,000
Universal Health Services of Delaware Inc \| Minimum
Related Party Transaction [Line Items]
Percentage of equity to be exceeded for incentive distribution			15.00%