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Relationship with Universal Health Realty Income Trust and Related Party Transactions - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Bed
Mar. 31, 2016
USD ($)
Hospital
Mar. 31, 2015
USD ($)
Hospital
Facility
RenewalOption
Dec. 31, 2015
USD ($)
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
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   $ 800,000 $ 700,000  
Pre-tax share of income from the Trust   250,000 200,000  
Carrying value of investment in Trust   8,400,000   8,700,000
Market value of investment in Trust   44,300,000   $ 39,400,000
Rent expense under operating leases   $ 4,000,000 $ 4,000,000  
Non-controlling ownership interests by subsidiaries   100.00%    
Number of hospital facilities | Hospital   3 3  
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      
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