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Segment Information - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2019
Facility
Bed
State
Segment Reporting Information [Line Items]  
Number of facilities | Facility 585
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 224
Number of beds | Bed 9,500
Number of operating states | State 40
U.K. Facilities [Member]  
Segment Reporting Information [Line Items]  
Number of facilities | Facility 361
Number of beds | Bed 8,700