Idled Facilities and Respective Carrying Values Excluding Equipment and Other Assets (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Bed	Dec. 31, 2016 USD ($)	Jun. 10, 2016 Bed	Aug. 27, 2015 Bed
Facility Activations Developments And Closures [Line Items]
Design Capacity			112	600
Prairie Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	1,600
Date Idled	2010
Net Carrying Value | $	$ 16,118	$ 17,071
Huerfano County Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	752
Date Idled	2010
Net Carrying Value | $	$ 16,980	17,542
Diamondback Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	2,160
Date Idled	2010
Net Carrying Value | $	$ 41,370	41,539
Southeast Kentucky Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	656
Date Idled	2012
Net Carrying Value | $	$ 21,864	22,618
Marion Adjustment Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	826
Date Idled	2013
Net Carrying Value | $	$ 12,058	12,135
Kit Carson Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	1,488
Date Idled	2016
Net Carrying Value | $	$ 57,095	58,819
Eden Detention Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	1,422
Date Idled	2017
Net Carrying Value | $	$ 39,707	41,269
Torrance County Detention Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	910
Date Idled	2017
Net Carrying Value | $	$ 36,882	38,109
Idle Facilities
Facility Activations Developments And Closures [Line Items]
Design Capacity	9,814
Net Carrying Value | $	$ 242,074	$ 249,102