Business Combinations - Additional Information (Detail)		3 Months Ended	12 Months Ended
	Aug. 27, 2015 Bed Facility	Dec. 31, 2015 USD ($) Bed Facility	Dec. 31, 2015 USD ($) Bed	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Number of beds at the facility | Bed	600	88,500	88,500
Number of facilities acquired | Facility	4
Revolving Credit Facility | $900.0 Million Revolving Credit Facility
Business Acquisition [Line Items]
Line of credit facility maximum borrowing capacity		$ 900,000,000	$ 900,000,000	$ 900,000,000
Avalon Correctional Services, Inc
Business Acquisition [Line Items]
Business acquisition, percentage of acquired stock		100.00%	100.00%
Number of beds at the facility | Bed		3,000	3,000
Number of facilities acquired | Facility		11
Aggregate purchase price		$ 157,500,000
Business acquisition, transaction related expenses			$ 3,000,000
Avalon Correctional Services, Inc | The achievement of certain utilization milestones 12 months following the acquisition
Business Acquisition [Line Items]
Amounts due under earn-outs business combinations		2,000,000	2,000,000
Avalon Correctional Services, Inc | The completion of and transition to a newly constructed facility that will deliver the contracted services provided at the Dallas Transitional Center
Business Acquisition [Line Items]
Amounts due under earn-outs business combinations		$ 5,500,000	$ 5,500,000