Lease Accounting - Additional Information (Detail) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Lease Bed Land RenewalOption	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Leases Disclosure [Line Items]
Lessee in connection with ground leases for land | Land				14
Right-of-use land assets		$ 8,891		$ 8,891		$ 8,914
Ground lease liabilities		$ 8,891		$ 8,891		8,914
PeaceHealth Medical Clinic Bellingham WA
Leases Disclosure [Line Items]
Lease expiration date				Dec. 31, 2021
Lease revenue				$ 2,100		2,800
Lease, Renewal Term		7 years		7 years
Extended Lease Expiration Date				Jan. 31, 2029
Number of Additional Lease Term | Lease				2
Remaining lease terms on ground leases				5 years
Kindred Chicago Central Hospital Central Chicago, Illinois
Leases Disclosure [Line Items]
Lease expiration date				Dec. 31, 2021
Lease revenue				$ 1,200		1,600
Number of beds in specialty hospital | Bed				95
Evansville Rehabilitation Hospital Evansville, Indiana
Leases Disclosure [Line Items]
Lease expiration date				May 31, 2019
Corpus Christi Corpus Christi Texas
Leases Disclosure [Line Items]
Lease expiration date				Jun. 01, 2019
Universal Health Services, Inc
Leases Disclosure [Line Items]
Lease revenue	[1]	$ 7,574	$ 6,381	$ 21,971	$ 18,243
Universal Health Services, Inc | Base Rents
Leases Disclosure [Line Items]
Lease revenue		5,392	4,402	15,820	12,940
Universal Health Services, Inc | Bonus Rents
Leases Disclosure [Line Items]
Lease revenue		$ 1,828	$ 1,680	$ 5,171	$ 4,477
Universal Health Services, Inc | Minimum
Leases Disclosure [Line Items]
Remaining lease terms on ground leases				28 years
Universal Health Services, Inc | Maximum
Leases Disclosure [Line Items]
Remaining lease terms on ground leases				78 years
Universal Health Services, Inc | Wellington Regional Medical Center
Leases Disclosure [Line Items]
Number of renewal options at fair market value lease rates | RenewalOption				2
Renewal options term at fair market value lease rates				5 years
Lease expiration date				Dec. 31, 2021
Universal Health Services, Inc | Wellington Regional Medical Center | Minimum
Leases Disclosure [Line Items]
Renewal options at fair market value lease rates expiration year				2022
Universal Health Services, Inc | Wellington Regional Medical Center | Maximum
Leases Disclosure [Line Items]
Renewal options at fair market value lease rates expiration year				2031
Universal Health Services, Inc | Southwest Healthcare System, Inland Valley Campus
Leases Disclosure [Line Items]
Number of renewal options at fair market value lease rates | RenewalOption				2
Renewal options term at fair market value lease rates				5 years
Lease expiration date				Dec. 31, 2021
Lease revenue				$ 3,400		4,400
Universal Health Services, Inc | Southwest Healthcare System, Inland Valley Campus | Base Rents
Leases Disclosure [Line Items]
Lease revenue				2,000		2,600
Universal Health Services, Inc | Southwest Healthcare System, Inland Valley Campus | Bonus Rents
Leases Disclosure [Line Items]
Lease revenue				$ 1,400		$ 1,800
Universal Health Services, Inc | Southwest Healthcare System, Inland Valley Campus | Minimum
Leases Disclosure [Line Items]
Renewal options at fair market value lease rates expiration year				2022
Universal Health Services, Inc | Southwest Healthcare System, Inland Valley Campus | Maximum
Leases Disclosure [Line Items]
Renewal options at fair market value lease rates expiration year				2031

[1] Includes bonus rental on UHS acute-care hospital facilities of $1,828 and $1,680 for the three-month periods ended September 30, 2021 and 2020, respectively, and $5,171 and $4,477 for the nine-month periods ended September 30, 2021 and 2020, respectively.