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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
Feb. 04, 2019
USD ($)
Jan. 31, 2019
USD ($)
Hospital
Apr. 30, 2019
AUD ($)
Mar. 31, 2019
Maximum [Member]        
Commitment And Contingencies [Line Items]        
Term of lease       15 years
Minimum [Member]        
Commitment And Contingencies [Line Items]        
Term of lease       10 years
Healthscope [Member]        
Commitment And Contingencies [Line Items]        
Number of facilities acquired | Hospital   11    
Purchase price of acquisition   $ 859.0    
Purchase price of acquisition paid to escrow $ 36.4      
Term of lease   20 years    
Healthscope [Member] | Maximum [Member]        
Commitment And Contingencies [Line Items]        
Ownership interests acquired   100.00%    
Subsequent Event [Member] | Healthscope [Member] | Australian Term Loan [Member]        
Commitment And Contingencies [Line Items]        
Term loan commitment amount     $ 1,200,000,000