Deferred Revenue - Additional Information (Detail) $ in Thousands	1 Months Ended			3 Months Ended			12 Months Ended
	Sep. 30, 2020	Oct. 31, 2016	Sep. 30, 2014 Facility	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2014 USD ($) Installment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Deferred Revenue Arrangement [Line Items]
Revenue							$ 1,905,485	$ 1,980,689	$ 1,835,766
South Texas Family Residential Center
Deferred Revenue Arrangement [Line Items]
Management contract, expiration date	2026-09	2021-09
ICE
Deferred Revenue Arrangement [Line Items]
Deferred Revenue - Noncurrent						$ 70,000
Non-cash revenue per quarter				$ 700	$ 3,400
Decrease in non-cash revenue per quarter				2,700
Revenue							167,700	170,600	$ 170,600
Deferred revenue				$ 15,200			$ 15,200	$ 26,100
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