Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 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	88,400
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	$ 6.6
Outstanding principal balance of the bonds exceeded the purchase price option	$ 5.8