Idled Facilities and Respective Carrying Values Excluding Equipment and Other Assets (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Bed	Dec. 31, 2018 USD ($)
Prairie Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	1,600
Date Idled	2010
Net Carrying Value | $	$ 15,086	$ 15,278
Huerfano County Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	752
Date Idled	2010
Net Carrying Value | $	$ 16,497	16,660
Diamondback Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	2,160
Date Idled	2010
Net Carrying Value | $	$ 40,800	40,962
Southeast Kentucky Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	656
Date Idled	2012
Net Carrying Value | $	$ 20,889	21,098
Marion Adjustment Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	826
Date Idled	2013
Net Carrying Value | $	$ 11,666	11,770
Kit Carson Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	1,488
Date Idled	2016
Net Carrying Value | $	$ 55,069	55,507
Eden Detention Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	1,422
Date Idled	2017
Net Carrying Value | $	$ 37,966	38,349
Torrance County Detention Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	910
Date Idled	2017
Net Carrying Value | $	$ 34,968	35,355
Idle Facilities
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	9,814
Net Carrying Value | $	$ 232,941	$ 234,979