Business Combinations - Additional Information (Detail)		3 Months Ended			9 Months Ended
	Apr. 08, 2016 USD ($) Bed Leases Entity Facility	Sep. 30, 2016 USD ($) Bed	Dec. 31, 2015 USD ($) Bed Facility	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Bed	Sep. 30, 2015 USD ($)	Jun. 10, 2016 Bed
Business Acquisition [Line Items]
Number of beds at the facility | Bed		89,300			89,300		112
Revenue		$ 474,935,000		$ 459,957,000	$ 1,385,651,000	$ 1,345,252,000
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		900,000,000
Avalon Correctional Services, Inc
Business Acquisition [Line Items]
Business acquisition, percentage of acquired stock			100.00%
Number of beds at the facility | Bed			3,000
Number of facilities acquired | Facility			11
Aggregate purchase price			$ 157,500,000
Revenue		$ 2,000,000			$ 2,000,000
Avalon Correctional Services, Inc | The achievement of certain utilization milestones over 12 months following the acquisition | Maximum
Business Acquisition [Line Items]
Amounts due under earn-outs business combinations			2,000,000
Avalon Correctional Services, Inc | The completion of and transition to a newly constructed facility that delivers the contracted services provided at the Dallas Transitional Center
Business Acquisition [Line Items]
Amounts due under earn-outs business combinations			$ 5,500,000
Correctional Management, Inc
Business Acquisition [Line Items]
Business acquisition, percentage of acquired stock	100.00%
Number of beds at the facility | Bed	600
Number of facilities acquired | Facility	6
Aggregate purchase price	$ 35,000,000
Number of entities affiliated | Entity	2
Number of facilities | Facility	7
Number of facilities leased | Leases	1