Real Estate Transactions - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($) Bed Person	Mar. 31, 2016 USD ($) Bed Person	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) Bed
Facility Activations Developments And Closures [Line Items]
Operating Expense		$ 313,918	$ 300,662
Number of beds at the facility | Bed		88,500
Expenditures for facility development and expansions		$ 7,793	63,366
Idle Facilities
Facility Activations Developments And Closures [Line Items]
Operating Expense		2,500	$ 1,800
Red Rock Correctional Center
Facility Activations Developments And Closures [Line Items]
Number of beds at the facility | Bed	1,596			1,596
Expected additional number of offenders to be managed by the company | Person	1,000
Expenditures for facility development and expansions		$ 8,800
Red Rock Correctional Center | New Contracts
Facility Activations Developments And Closures [Line Items]
Number of beds at the facility | Bed	2,024			2,024
Trousdale Turner Correctional Center
Facility Activations Developments And Closures [Line Items]
Number of beds at the facility | Bed		2,552
Percentage of guaranteed occupancy under management contract				90.00%
Amount invested to acquire property	$ 144,000			$ 144,000
Number of inmates | Person		1,200
Noncore Business | Idle Facilities
Facility Activations Developments And Closures [Line Items]
Net Carrying Value	$ 5,100	$ 5,100		$ 5,100
Minimum | Red Rock Correctional Center
Facility Activations Developments And Closures [Line Items]
Expenditures for facility development and expansions		35,000
Maximum | Red Rock Correctional Center
Facility Activations Developments And Closures [Line Items]
Expenditures for facility development and expansions		$ 38,000