Deferred Revenue - Additional Information (Detail) $ in Thousands	1 Months Ended		3 Months Ended									12 Months Ended
	Oct. 31, 2016	Sep. 30, 2014 Facility	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2014 USD ($) Installment	Dec. 31, 2018 USD ($) Agreement	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 10, 2016 Bed
Deferred Revenue Arrangement [Line Items]
Number of beds at the facility | Bed															112
Revenue			$ 482,193	$ 462,728	$ 449,929	$ 440,916	$ 440,576	$ 442,845	$ 436,393	$ 445,684		$ 1,835,766	$ 1,765,498	$ 1,849,785
South Texas Family Residential Center
Deferred Revenue Arrangement [Line Items]
Management contract, expiration date	2021-09
ICE
Deferred Revenue Arrangement [Line Items]
Deferred Revenue - Noncurrent											$ 70,000
Number of distinct multiple element arrangements | Agreement												5
Revenue												$ 170,600	170,100	$ 266,800
Deferred revenue			$ 39,700				$ 53,400					$ 39,700	$ 53,400
ICE | Installment Payment
Deferred Revenue Arrangement [Line Items]
Amount to be settled as an installment											$ 35,000
Number of installments | Installment											2
Installments due											Dec. 31, 2014
Maximum | South Texas Family Residential Center
Deferred Revenue Arrangement [Line Items]
Number of beds at the facility | Facility		2,400
Management contract, initial term		4 years
Minimum | South Texas Family Residential Center
Deferred Revenue Arrangement [Line Items]
Agreement notice period for termination		60 days