Relationship with Universal Health Realty Income Trust and Other Related Party Transactions - Additional Information (Detail)	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 31, 2022 USD ($) Bed SquareFoot	Sep. 30, 2022 USD ($) Facility Hospital	Sep. 30, 2021 USD ($) Hospital	Dec. 31, 2013	Sep. 30, 2022 USD ($) Facility Hospital Bed	Sep. 30, 2021 USD ($) Hospital	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Net revenues		$ 3,336,027,000	$ 3,155,999,000		$ 9,952,390,000	$ 9,366,866,000
Lease and rental expense		33,264,000	28,375,000		$ 97,075,000	$ 88,848,000
Number of hospital facilities | Hospital					5
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								$ 1,000,000.0
Chief Executive Officer | Scenario Forecast
Related Party Transaction [Line Items]
Payments to acquire life insurance policies, net							$ 1,000,000.0
Chief Executive Officer | Trust Owned by CEO
Related Party Transaction [Line Items]
Estimated payments to acquire life insurance policies					9,000,000
Minimum | Chief Executive Officer
Related Party Transaction [Line Items]
Estimated death benefit proceeds					$ 37,000,000
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		275,000	276,000		$ 882,000	$ 977,000
Dividends received from the Trust		559,000	552,000		1,700,000	1,700,000
Carrying value of investment in Trust		8,600,000			8,600,000			$ 9,400,000
Market value of investment in Trust		34,000,000.0			34,000,000.0			46,800,000
Financial liability included in debt		81,700,000			81,700,000
Lease and rental expense		$ 5,000,000	$ 4,000,000		$ 15,000,000	$ 13,000,000
Number of hospital facilities | Hospital		4	3		4	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	86,000
Number of beds available in acute care hospital | Bed	170
Percentage of master lease rentable square feet	68.00%
Relationship with Universal Health Realty Income Trust | Minimum
Related Party Transaction [Line Items]
Lease and rental expense	$ 1,300,000
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 | 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 | Aiken, South Carolina | Behavioral Health Care Facility
Related Party Transaction [Line Items]
Lease and rental expense		$ 657,000	$ 631,000		$ 2,000,000.0	$ 1,800,000
Notice period on renewal of lease					270 days
Period of rights of refusal to leased facilities					30 days
Number of bed available in behavioral health care facility | Bed					100
Relationship with Universal Health Realty Income Trust | Aiken Regional Medical Center
Related Party Transaction [Line Items]
Lease rent receivable					$ 3,900,000
Relationship with Universal Health Realty Income Trust | Canyon Creek Behavioral Health
Related Party Transaction [Line Items]
Lease rent receivable					1,800,000
Relationship with Universal Health Realty Income Trust | Aiken Regional Medical Center and Canyon Creek Behavioral Health
Related Party Transaction [Line Items]
Lease rent receivable					$ 5,700,000
Number of facilities leased | Facility					2
Relationship with Universal Health Realty Income Trust | Aiken Regional Medical Center and Canyon Creek Behavioral Health | Bonus Rental
Related Party Transaction [Line Items]
Lease revenue					$ 0
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries
Related Party Transaction [Line Items]
Cash received for sale of real estate asset								4,100,000
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Inland Valley Campus of Southwest Healthcare System | Wildomar, California
Related Party Transaction [Line Items]
Fair market value of real estate assets received								79,600,000
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Aiken Regional Medical Center | Aiken South Carolina
Related Party Transaction [Line Items]
Fair market value of real estate assets sold								57,700,000
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Canyon Creek Behavioral Health | Temple, Texas
Related Party Transaction [Line Items]
Fair market value of real estate assets sold								26,000,000.0
Relationship with Universal Health Realty Income Trust | Asset Purchase and Sale Agreement | Subsidiaries | Aiken Regional Medical Center and Canyon Creek Behavioral Health
Related Party Transaction [Line Items]
Fair market value of real estate assets sold								83,700,000
Relationship with Universal Health Realty Income Trust | Other Related Party Transactions
Related Party Transaction [Line Items]
Trust outstanding shares held, percentage		5.70%			5.70%
Relationship with Universal Health Realty Income Trust | Advisory Fee
Related Party Transaction [Line Items]
Net revenues		$ 1,300,000	1,100,000		$ 3,800,000	3,300,000
Premier, Inc. | Other (Income) Expense, Net
Related Party Transaction [Line Items]
Dividend		$ 470,000	$ 400,000		1,400,000	$ 1,300,000
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					$ 76,000,000			$ 92,000,000