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Segment Information - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2019
Facility
Bed
State
Segment Reporting Information [Line Items]  
Number of facilities | Facility 589
Number of beds | Bed 18,000
Number of operating states | State 40
U.S. Facilities [Member]  
Segment Reporting Information [Line Items]  
Number of facilities | Facility 224
Number of beds | Bed 9,300
Number of operating states | State 40
U.K. Facilities [Member]  
Segment Reporting Information [Line Items]  
Number of facilities | Facility 365
Number of beds | Bed 8,700