Relationship with Universal Health Realty Income Trust and Other Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Net revenues	$ 3,843,582,000	$ 3,467,518,000
Acute Care Hospital Services
Related Party Transaction [Line Items]
Net revenues	$ 2,185,081,000	$ 1,973,532,000
Relationship with Universal Health Realty Income Trust
Related Party Transaction [Line Items]
Percentage of advisory fee on average invested real estate assets	0.70%	0.70%	0.70%	0.70%	0.70%
Pre-tax share of income from the Trust	$ 300,000	$ 300,000
Dividends received from the Trust	571,000	563,000
Carrying value of investment in Trust	6,700,000		$ 7,000,000.0
Market value of investment in Trust	$ 28,900,000		$ 34,100,000
Relationship with Universal Health Realty Income Trust | Other Related Party Transactions
Related Party Transaction [Line Items]
Trust outstanding shares held, percentage	5.70%
Relationship with Universal Health Realty Income Trust | Advisory Fee
Related Party Transaction [Line Items]
Net revenues	$ 1,300,000	$ 1,300,000