Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016 State Beds Facilities
Segment Reporting Information [Line Items]
Number of facilities | Facilities	591
Number of beds | Beds	17,800
Number of operating states | State	39
U.S. Facilities [Member]
Segment Reporting Information [Line Items]
Number of facilities | Facilities	211
Number of beds | Beds	8,400
Number of operating states | State	39
U.K. Facilities [Member]
Segment Reporting Information [Line Items]
Number of facilities | Facilities	380
Number of beds | Beds	9,400