Relationship with Universal Health Realty Income Trust and Other Related Party Transactions - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($) Bed	Mar. 31, 2015 USD ($) Facility RenewalOption	Dec. 31, 2015 USD ($) Facility Hospital	Dec. 31, 2014 USD ($) Hospital	Dec. 31, 2013 USD ($) Facility Hospital
Related Party Transaction [Line Items]
Number of hospital facilities | Facility			3		3
Chief Executive Officer
Related Party Transaction [Line Items]
Estimated payments to acquire life insurance policies			$ 25,000,000
Payments to acquire life insurance policies			1,300,000	$ 1,300,000	$ 1,300,000
Chief Executive Officer | Trust Owned by Chief Executive Officer
Related Party Transaction [Line Items]
Estimated payments to acquire life insurance policies			8,000,000
Minimum | Chief Executive Officer
Related Party Transaction [Line Items]
Estimated death benefit proceeds			$ 33,000,000
Relationship with Universal Health Realty Income Trust
Related Party Transaction [Line Items]
Trust outstanding shares held, percentage			5.90%
Advisory fee earned			$ 2,800,000	$ 2,500,000	$ 2,400,000
Percentage of advisory fee on average invested real estate assets			0.70%	0.70%	0.70%
Pre-tax share of income from the Trust			$ 1,400,000	$ 3,200,000	$ 842,000
Share of gain included in the share of trust			500,000	2,300,000
Carrying value of investment in Trust	$ 9,300,000		8,700,000	9,300,000
Market value of investment in Trust	37,900,000		39,400,000	37,900,000
Rent expense under operating leases			$ 15,600,000	$ 16,800,000	$ 16,400,000
Number of hospital facilities | Hospital			3	4	4
Non-controlling ownership interests by subsidiaries			100.00%
Lease renewal period, years			5 years
Aggregate construction cost/sales proceeds		$ 13,000,000
Aggregate rent expense paid	1,100,000	$ 900,000
Estimated purchase price of The Bridgeway's real property	$ 17,300,000			$ 17,300,000
Notice period on renewal of lease			90 days
Period of rights of refusal to leased facilities			180 days
Relationship with Universal Health Realty Income Trust | Behavioral Health Facility
Related Party Transaction [Line Items]
Number of beds | Bed	103
Relationship with Universal Health Realty Income Trust | Texas
Related Party Transaction [Line Items]
Lease initial terms		10 years
Number of free-standing emergency departments to be acquired | Facility		2
Number of renewal options at existing lease rates | RenewalOption		6
Renewal options term at existing lease rates		5 years
Renewal options term at fair market lease rates		5 years
Relationship with Universal Health Realty Income Trust | Minimum
Related Party Transaction [Line Items]
Lease initial terms			13 years
Relationship with Universal Health Realty Income Trust | Maximum
Related Party Transaction [Line Items]
Lease initial terms			15 years