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Segment Information - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2019
Facility
Bed
State
Segment Reporting Information [Line Items]  
Number of facilities | Facility 595
Number of beds | Bed 18,200
Number of operating states | State 40
U.S. Facilities [Member]  
Segment Reporting Information [Line Items]  
Number of facilities | Facility 225
Number of beds | Bed 9,400
Number of operating states | State 40
U.K. Facilities [Member]  
Segment Reporting Information [Line Items]  
Number of facilities | Facility 370
Number of beds | Bed 8,800