Relationship with Universal Health Realty Income Trust and Other Related Party Transactions - Additional Information (Detail)	3 Months Ended									12 Months Ended
	Dec. 31, 2020 USD ($) Facility $ / shares	Sep. 30, 2020 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2013	Dec. 31, 2020 USD ($) Hospital Facility Bed SquareFoot Lease	Dec. 31, 2019 USD ($) Hospital	Dec. 31, 2018 USD ($) Hospital
Related Party Transaction [Line Items]
Net revenues	$ 3,086,935,000	$ 2,912,541,000	$ 2,729,754,000	$ 2,829,667,000	$ 2,896,247,000	$ 2,822,453,000	$ 2,855,168,000	$ 2,804,391,000		$ 11,558,897,000	$ 11,378,259,000	$ 10,772,278,000
Number of hospital facilities | Hospital										3
Chief Executive Officer
Related Party Transaction [Line Items]
Estimated payments to acquire life insurance policies										$ 28,000,000
Payments to acquire life insurance policies, net										1,100,000	$ 1,100,000	$ 1,100,000
Chief Executive Officer | Trust Owned by CEO
Related Party Transaction [Line Items]
Estimated payments to acquire life insurance policies										$ 9,000,000
Joint Venture Agreement
Related Party Transaction [Line Items]
Lease initial terms	20 years									20 years
Lease renewal period, years										10 years
Number of beds | Bed										108
End of Lease Term										2020-12
Number of triple net lease | Lease										5
Number of square foot to be constructed | SquareFoot										82,000
Expected aggregate fee										$ 750,000
Estimated project cost										35,100,000
Estimated initial annual rent										$ 2,500,000
Southwest Healthcare System, Inland Valley Campus
Related Party Transaction [Line Items]
Lease expiration date										Dec. 31, 2021
Annual Minimum Rent										$ 2,648,000
End of Lease Term										2021-12
Minimum
Related Party Transaction [Line Items]
Lease initial terms	5 years									5 years
Minimum | Chief Executive Officer
Related Party Transaction [Line Items]
Estimated death benefit proceeds										$ 37,000,000
Maximum
Related Party Transaction [Line Items]
Lease initial terms	10 years									10 years
Relationship with Universal Health Realty Income Trust
Related Party Transaction [Line Items]
Trust outstanding shares held, percentage	5.70%									5.70%
Percentage of advisory fee on average invested real estate assets										0.70%	0.70%	0.70%
Pre-tax share of income from the Trust										$ 1,100,000	$ 1,100,000	$ 1,400,000
Dividends received from the Trust										2,200,000	2,100,000	2,100,000
Carrying value of investment in Trust	$ 5,400,000				6,400,000					5,400,000	6,400,000
Market value of investment in Trust	$ 50,600,000				$ 92,400,000					$ 50,600,000	92,400,000
Lease initial terms	10 years									10 years
Lease renewal period, years										5 years
Rent expense under operating leases										$ 17,100,000	$ 16,400,000	$ 16,000,000.0
Number of hospital facilities | Hospital										3	3	3
Notice period on renewal of lease										90 days
Period of rights of refusal to leased facilities										180 days
Number of free-standing emergency departments to be acquired | Facility	2									2
Number of square feet to be constructed | SquareFoot										75,000
Percentage of master lease rentable square feet										50.00%
Annual Minimum Rent										$ 644,000
Number of flex lease commitment rentable square feet | SquareFoot										5,840
Relationship with Universal Health Realty Income Trust | Minimum
Related Party Transaction [Line Items]
Lease initial terms	13 years									13 years
Relationship with Universal Health Realty Income Trust | Minimum | Limited Liability Companies
Related Party Transaction [Line Items]
Non-controlling ownership interests by subsidiaries	95.00%									95.00%
Relationship with Universal Health Realty Income Trust | Maximum
Related Party Transaction [Line Items]
Lease initial terms	15 years									15 years
Relationship with Universal Health Realty Income Trust | Maximum | Limited Liability Companies
Related Party Transaction [Line Items]
Non-controlling ownership interests by subsidiaries	100.00%									100.00%
Relationship with Universal Health Realty Income Trust | Advisory Fee
Related Party Transaction [Line Items]
Net revenues										$ 4,100,000	$ 4,000,000.0	$ 3,800,000
Premier, Inc.
Related Party Transaction [Line Items]
Cash dividend declared per share | $ / shares	$ 0.19	$ 0.19
Premier, Inc. | Other (Income) Expense, Net
Related Party Transaction [Line Items]
Dividend										800,000
Premier, Inc. | Other (Income) Expense, Net | ASU 2016-01
Related Party Transaction [Line Items]
Unrealized gain (loss)										(4,000,000)	(4,000,000)
Premier, Inc. | Group Purchasing Organization Agreement | Restricted Stock
Related Party Transaction [Line Items]
Shares vesting period									7 years
Shares vesting period start year									2014
Shares vesting period end year									2020
Market value of retained vested shares										78,000,000	70,000,000
Unrealized gain (loss)										8,000,000
Additional vested shares, value										$ 12,000,000	$ 12,000,000