Business Combinations - Additional Information (Detail)			3 Months Ended								12 Months Ended
	Apr. 08, 2016 USD ($) Bed Leases Entity Facility	Aug. 27, 2015 Bed Facility	Dec. 31, 2016 USD ($) Bed	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Bed Facility	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) Bed	Dec. 31, 2015 USD ($) Bed	Dec. 31, 2014 USD ($)	Jun. 10, 2016 Bed
Business Acquisition [Line Items]
Number of beds at the facility | Bed		600	89,700								89,700			112
Number of facilities acquired | Facility		4
Revenue			$ 464,134,000	$ 474,935,000	$ 463,331,000	$ 447,385,000	$ 447,835,000	$ 459,957,000	$ 459,295,000	$ 426,000,000	$ 1,849,785,000	$ 1,793,087,000	$ 1,646,867,000
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	$ 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
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					$ 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					$ 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