Idled Facilities and Respective Carrying Values Excluding Equipment and Other Assets (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) Bed	Dec. 31, 2016 USD ($)
Prairie Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	1,600
Date Idled	2010
Net Carrying Value | $	$ 16,315	$ 17,071
Huerfano County Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	752
Date Idled	2010
Net Carrying Value | $	$ 17,060	17,542
Diamondback Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	2,160
Date Idled	2010
Net Carrying Value | $	$ 40,571	41,539
Southeast Kentucky Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	656
Date Idled	2012
Net Carrying Value | $	$ 22,074	22,618
Marion Adjustment Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	826
Date Idled	2013
Net Carrying Value | $	$ 12,161	12,135
Lee Adjustment Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	816
Date Idled	2015
Net Carrying Value | $	$ 10,565	10,342
Kit Carson Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	1,488
Date Idled	2016
Net Carrying Value | $	$ 57,505	58,819
Eden Detention Center
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	1,422
Date Idled	2017
Net Carrying Value | $	$ 40,072	41,269
Idle Facilities
Facility Activations Developments And Closures [Line Items]
Design Capacity | Bed	9,720
Net Carrying Value | $	$ 216,323	$ 221,335