Idled Facilities and Respective Carrying Values Excluding Equipment and Other Assets (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Bed	Dec. 31, 2017 USD ($)	Jun. 10, 2016 Bed
Facility Activations Developments And Closures [Line Items]
Design Capacity			112
Prairie Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	1,600
Date Idled	2010
Net Carrying Value | $	$ 15,278	$ 16,118
Huerfano County Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	752
Date Idled	2010
Net Carrying Value | $	$ 16,660	16,980
Diamondback Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	2,160
Date Idled	2010
Net Carrying Value | $	$ 40,962	41,370
Southeast Kentucky Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	656
Date Idled	2012
Net Carrying Value | $	$ 21,098	21,864
Marion Adjustment Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	826
Date Idled	2013
Net Carrying Value | $	$ 11,770	12,058
Kit Carson Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	1,488
Date Idled	2016
Net Carrying Value | $	$ 55,507	57,095
Eden Detention Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	1,422
Date Idled	2017
Net Carrying Value | $	$ 38,349	39,707
Torrance County Detention Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	910
Date Idled	2017
Net Carrying Value | $	$ 35,355	36,882
Idle Facilities
Facility Activations Developments And Closures [Line Items]
Design Capacity	9,814
Net Carrying Value | $	$ 234,979	$ 242,074