Business Combinations - Additional Information (Detail) $ in Millions						12 Months Ended
	Dec. 01, 2018 USD ($) State	Jan. 02, 2018 USD ($) State	Nov. 01, 2017 USD ($) Facility Bed	Jun. 01, 2017 USD ($) Bed	Apr. 08, 2016 USD ($) Facility Bed Entity Lease	Dec. 31, 2018 Transaction	Dec. 31, 2017 Transaction
Business Acquisition [Line Items]
Number of purchase price transactions | Transaction						2	2
Correctional Management, Inc
Business Acquisition [Line Items]
Business acquisition, percentage of acquired stock					100.00%
Number of entities affiliated | Entity					2
Number of facilities | Facility					7
Number of facilities acquired | Facility					6
Number of facilities leased | Lease					1
Number of beds at the center | Bed					600
Aggregate purchase price					$ 35.0
Center Point, Inc.
Business Acquisition [Line Items]
Number of beds at the center | Bed				200
Aggregate purchase price				$ 5.3
Time to Change, Inc.
Business Acquisition [Line Items]
Number of facilities | Facility			3
Number of beds at the center | Bed			422
Aggregate purchase price			$ 22.0
Loss on settlement of contingent consideration			$ 6.1
Rocky Mountain Offender Management Systems, LLC
Business Acquisition [Line Items]
Aggregate purchase price		$ 7.0
Number of states in which company facilities are located | State		7
Recovery Monitoring Solutions Corporation
Business Acquisition [Line Items]
Aggregate purchase price	$ 15.9
Number of states in which company facilities are located | State	4