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Acquisitions - Priory Acquisition - Additional Information (Detail)
$ in Thousands, £ in Millions
3 Months Ended 12 Months Ended
Nov. 30, 2016
GBP (£)
Oct. 18, 2016
Bed
Facility
Feb. 16, 2016
USD ($)
Bed
Facility
shares
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]                            
Number of beds to be sold | Bed   1,000                        
Cash received from sale of business £ 320                     $ 373,266    
Loss on divestiture                       (178,809)    
Revenue                       2,810,914 $ 1,794,492 $ 1,004,601
Income from continuing operations before income taxes       $ 42,438 $ (115,814) $ 73,852 $ 32,479 $ 52,518 $ 41,645 $ 49,355 $ 21,205 32,955 164,753 $ 126,154
U.K. Behavioral Health Facilities [Member]                            
Business Acquisition [Line Items]                            
Number of facilities to be sold | Facility   21                        
De novo Behavioral Health Facility [Member]                            
Business Acquisition [Line Items]                            
Number of facilities to be sold | Facility   1                        
U.K. Disposal Group [Member]                            
Business Acquisition [Line Items]                            
Loss on divestiture         $ 174,700             175,000    
Revenue                       154,700 58,500  
Income from continuing operations before income taxes                       81,200 $ 17,000  
U.K. Disposal Group [Member] | Allocation of Goodwill [Member]                            
Business Acquisition [Line Items]                            
Loss on divestiture                       106,900    
U.K. Disposal Group [Member] | Estimated Transaction Related Expense [Member]                            
Business Acquisition [Line Items]                            
Loss on divestiture                       26,100    
U.K. Disposal Group [Member] | Loss on Sale of Properties [Member]                            
Business Acquisition [Line Items]                            
Loss on divestiture                       $ 42,000    
Priory [Member]                            
Business Acquisition [Line Items]                            
Total consideration related to acquisition     $ 2,200,000                      
Business acquisition cash paid     $ 1,900,000                      
Shares issued for acquisition | shares     4,033,561                      
Number of facilities acquired | Facility     324                      
Number of beds | Bed     7,100