Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) Bed LegalMatter	Dec. 31, 1997 USD ($) Facility
Loss Contingencies [Line Items]
Number of pending legal proceedings that would have an effect on consolidated financial position, results of operations, or cash flows | LegalMatter	0
Number of beds at the facility | Bed	83,500
Hardeman County Correctional Facilities Corporation
Loss Contingencies [Line Items]
Issuance of revenue bonds		$ 72.7
Number of beds at the facility | Facility		2,016
Outstanding principal balance of revenue bonds	$ 18.6
Outstanding principal balance of the bonds exceeded the purchase price option	$ 9.5