Relationship with Universal Health Services, Inc. ("UHS") and Related Party Transactions - Additional Information (Detail)		1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
		Jan. 31, 2022 USD ($) ft²	May 31, 2021 USD ($)	Sep. 30, 2022 USD ($) Hospital Time Lease	Mar. 31, 2022 USD ($) Subsidiary	Sep. 30, 2021 USD ($) Hospital	Sep. 30, 2022 USD ($) Property Subsidiary Hospital Bed Time RenewalOption Lease	Sep. 30, 2021 USD ($) Hospital	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Number of bed facility | Bed							100
Annual advisory fee as percentage of average invested real estate assets				0.70%		0.70%	0.70%	0.70%
Grayson Properties Member
Related Party Transaction [Line Items]
Minority ownership interest held by a third-party										5.00%
Ownership percentage upon completion of the minority ownership purchase										100.00%
Minority ownership interest										$ 3,100,000
Aiken Regional Medical Center
Related Party Transaction [Line Items]
Monthly lease rent receivable					$ 3,900,000
Canyon Creek Behavioral Health
Related Party Transaction [Line Items]
Monthly lease rent receivable					1,800,000
Aiken Regional Medical Center and Canyon Creek Behavioral Health
Related Party Transaction [Line Items]
Fair market value of real estate assets received							$ 83,700,000			82,400,000
Monthly lease rent receivable					$ 5,700,000
Aiken Regional Medical Center and Canyon Creek Behavioral Health | Forecast
Related Party Transaction [Line Items]
Lease payments expected									$ 5,500,000
Aiken Regional Medical Center and Canyon Creek Behavioral Health | Southwest Healthcare System Inland Valley Campus
Related Party Transaction [Line Items]
Lease revenue										4,500,000
Aiken Regional Medical Center and Canyon Creek Behavioral Health | Southwest Healthcare System Inland Valley Campus | Base Rents
Related Party Transaction [Line Items]
Lease revenue										2,600,000
Aiken Regional Medical Center and Canyon Creek Behavioral Health | Southwest Healthcare System Inland Valley Campus | Bonus Rents
Related Party Transaction [Line Items]
Lease revenue										$ 1,900,000
Universal Health Services Inc
Related Party Transaction [Line Items]
Percentage of lease guaranteed							52.00%
Lease revenue	[1]			$ 7,471,000		$ 7,574,000	$ 22,291,000	$ 21,971,000
Number of acute care hospital leased | Hospital				3		3	3	3
Number of behavioral health care hospital leased | Hospital				3		1	3	1
Number of hospital facilities leased | Hospital							6
Number of medical office buildings and free standing emergency departments | Property							20
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 ground leases | Lease				12			12
Aggregate lease payments for 2022				$ 508,000			$ 508,000
Aggregate lease payments for 2023				508,000			508,000
Aggregate lease payments for 2024				508,000			508,000
Aggregate lease payments for 2025				508,000			508,000
Aggregate lease payments for 2026				508,000			508,000
Aggregate lease payments for thereafter				$ 28,000,000.0			$ 28,000,000.0
Percentage ownership of outstanding shares				5.70%			5.70%			5.70%
Universal Health Services Inc | Minimum
Related Party Transaction [Line Items]
Remaining lease terms on ground leases							27 years
Universal Health Services Inc | Maximum
Related Party Transaction [Line Items]
Remaining lease terms on ground leases							76 years
Universal Health Services Inc | Customer Concentration Risk | Revenues
Related Party Transaction [Line Items]
Percentage of revenues generated from leases and tenants				27.00%		26.00%	27.00%	26.00%
Universal Health Services Inc | Customer Concentration Risk | Revenues | Tenants
Related Party Transaction [Line Items]
Percentage of revenues generated from leases and tenants				41.00%		37.00%	41.00%	36.00%
Universal Health Services Inc | Base Rents
Related Party Transaction [Line Items]
Lease revenue				$ 6,102,000		$ 5,392,000	$ 18,303,000	$ 15,820,000
Universal Health Services Inc | Bonus Rents
Related Party Transaction [Line Items]
Lease revenue				$ 727,000		1,828,000	$ 2,048,000	5,171,000
Universal Health Services Inc | Acute Care Hospitals
Related Party Transaction [Line Items]
Number of hospitals operating lease terms of existing and renewal options | Hospital							3
Universal Health Services Inc | Behavioral Health Hospitals
Related Party Transaction [Line Items]
Number of hospitals operating lease terms of existing and renewal options | Hospital							3
Universal Health Services Inc | Wellington Regional Medical Center
Related Party Transaction [Line Items]
Renewal options term at fair market value lease rates							5 years
Renewal options at fair market value lease rates expiration year							2031
Universal Health Services Inc | Clive, Iowa | Clive Behavioral Health
Related Party Transaction [Line Items]
Option to renew lease, notice period prior to termination date of current term							270 days
Initial lease term on property							20 years
Lessee operating lease, existence of option to extend							true
Number of term renewal options | Time				5			5
Number of lease renewal option exercised | Time							3
Renewal option term							10 years
Percentage of annual rental increase on cumulative and compound basis							2.75%
Number of additional renewal options at fair market value lease rates | RenewalOption							2
Renewal options term at fair market value lease rates							10 years
Period to purchase respective leased facilities prior to end of lease term or renewal terms							270 days
Universal Health Services Inc | Clive, Iowa | Clive Behavioral Health | Minimum
Related Party Transaction [Line Items]
Renewal options at fair market value lease rates expiration year							2071
Universal Health Services Inc | Clive, Iowa | Clive Behavioral Health | Maximum
Related Party Transaction [Line Items]
Renewal options at fair market value lease rates expiration year							2090
Universal Health Services Inc | Palm Beach, Florida | Wellington Regional Medical Center
Related Party Transaction [Line Items]
Monthly lease rent receivable				$ 6,300,000			$ 6,300,000
Lease revenue										$ 5,500,000
Lessee operating lease, existence of option to extend							true
Percentage of annual rental increase on cumulative and compound basis							2.50%
Operating lease renewal term				5 years			5 years
Universal Health Services Inc | Palm Beach, Florida | Wellington Regional Medical Center | Base Rents
Related Party Transaction [Line Items]
Lease revenue										3,000,000.0
Universal Health Services Inc | Palm Beach, Florida | Wellington Regional Medical Center | Bonus Rents
Related Party Transaction [Line Items]
Lease revenue										2,500,000
Universal Health Services Inc | Subsidiary
Related Party Transaction [Line Items]
Number of wholly-owned subsidiaries | Subsidiary					2
Financing receivables				$ 83,700,000			$ 83,700,000
Universal Health Services Inc | Subsidiary | Aiken Regional Medical Center and Canyon Creek Behavioral Health
Related Party Transaction [Line Items]
Financing receivables										$ 82,400,000
Universal Health Services Inc | Asset Purchase and Sale Agreement | Subsidiary
Related Party Transaction [Line Items]
Cash received for sale of real estate asset					$ 4,100,000
Universal Health Services Inc | Asset Purchase and Sale Agreement | Subsidiary | Inland Valley Campus of Southwest Healthcare System | Wildomar, California
Related Party Transaction [Line Items]
Fair market value of real estate asset sold					79,600,000
Universal Health Services Inc | Asset Purchase and Sale Agreement | Subsidiary | Aiken Regional Medical Center | Aiken, South Carolina
Related Party Transaction [Line Items]
Fair market value of real estate assets received					57,700,000
Universal Health Services Inc | Asset Purchase and Sale Agreement | Subsidiary | Canyon Creek Behavioral Health | Temple, Texas
Related Party Transaction [Line Items]
Fair market value of real estate assets received					26,000,000.0
Universal Health Services Inc | Asset Purchase and Sale Agreement | Subsidiary | Aiken Regional Medical Center and Canyon Creek Behavioral Health
Related Party Transaction [Line Items]
Number of wholly-owned subsidiaries | Subsidiary							2
Fair market value of real estate assets received					$ 83,700,000
Universal Health Services Inc | Ground Lease and Master Flex-lease Agreement | Reno, Nevada | Sierra Medical Plaza I
Related Party Transaction [Line Items]
Rentable square feet | ft²		86,000
Cost of medical office building		$ 34,600,000
Cost Of Medical Office Building Incurred							$ 16,900,000
Percentage of rentable square feet		68.00%
Universal Health Services Inc | Ground Lease and Master Flex-lease Agreement | Reno, Nevada | Sierra Medical Plaza I | Minimum
Related Party Transaction [Line Items]
Initial rent		$ 1,300,000
Catholic Health Initiatives Iowa
Related Party Transaction [Line Items]
Percentage of lease guaranteed							48.00%
Fire Mesa Office Building [Member]
Related Party Transaction [Line Items]
Payment to acquire business			$ 12,900,000
Lease percentage			100.00%
Lease expiration date			Aug. 31, 2027
Universal Health Services of Delaware Inc
Related Party Transaction [Line Items]
Advisory fee				$ 1,300,000		$ 1,100,000	$ 3,800,000	$ 3,300,000
Cost, Product and Service [Extensible List]				Management Service		Management Service	Management Service	Management Service
Average invested real estate assets				$ 741,000,000		$ 641,000,000	$ 721,000,000	$ 623,000,000

[1] Includes bonus rental on McAllen Medical Center, a UHS acute care hospital facility of $727 and $2,048 for the three and nine-month periods ended September 30, 2022, respectively, and includes bonus rental on three UHS acute care hospital facilities of $1,828 and $5,171 for the three and nine-month periods ended September 30, 2021, respectively