Lease Accounting - Additional Information (Detail)		3 Months Ended		12 Months Ended
		Mar. 31, 2023 USD ($) Facility Land Property	Mar. 31, 2022 USD ($) Subsidiary	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 Subsidiary Lease
Leases Disclosure [Line Items]
Number of properties | Property		2
Operating expenses excluding depreciation and amortization expense		$ 187,000	$ 175,000
Lessee in connection with ground leases for land | Land		15
Right-of-use land assets		$ 11,836,000			$ 11,457,000
Ground lease liabilities		11,836,000			11,457,000
Specialty Hospital In Chicago, Illinois
Leases Disclosure [Line Items]
Lease Demolition Cost		265,000			1,400,000
Other operating expenses demolition costs		265,000
Operating expenses demolition costs		417,000	494,000
Operating expenses including demolition costs		597,000
Operating expenses excluding demolition		$ 152,000
Specialty Hospital In Chicago, Illinois | Forecast
Leases Disclosure [Line Items]
Operating expenses excluding demolition				$ 1,300,000
Evansville Rehabilitation Hospital Evansville, Indiana and Corpus Christi Facility Corpus Christi, Texas
Leases Disclosure [Line Items]
Number of specialty facilities | Facility		2
Aiken Regional Medical Center and Canyon Creek Behavioral Health
Leases Disclosure [Line Items]
Fair market value of real estate assets received		$ 83,500,000			$ 83,600,000
Monthly lease rent receivable			5,800,000
Lease payments expected		1,400,000	1,400,000
Lease expiration date						Dec. 31, 2033
Aiken Regional Medical Center and Canyon Creek Behavioral Health | Forecast
Leases Disclosure [Line Items]
Lease payments expected				$ 5,500,000
Aiken Regional Medical Center
Leases Disclosure [Line Items]
Monthly lease rent receivable			4,000,000.0
Canyon Creek Behavioral Health
Leases Disclosure [Line Items]
Monthly lease rent receivable			1,800,000
Universal Health Services, Inc
Leases Disclosure [Line Items]
Lease revenue	[1]	$ 7,787,000	$ 7,426,000
Universal Health Services, Inc | Subsidiary
Leases Disclosure [Line Items]
Number of wholly-owned subsidiaries | Subsidiary			2
Financing Arrangements
Leases Disclosure [Line Items]
Number of lease property | Lease						2
Asset Purchase and Sale Agreement | Universal Health Services, Inc | Subsidiary | Aiken Regional Medical Center and Canyon Creek Behavioral Health
Leases Disclosure [Line Items]
Number of wholly-owned subsidiaries | Subsidiary						2
Fair market value of real estate assets received			$ 83,700,000

[1] Includes bonus rental on McAllen Medical Center, a UHS acute care hospital facility of $764 and $678 for the three-month periods ended March 31, 2023 and 2022, respectively.