Idled Facilities and Respective Carrying Values Excluding Equipment and Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prairie Correctional Facility
Facility Activations Developments And Closures [Line Items]
Net Carrying Value	$ 14,646	$ 14,863
Huerfano County Correctional Center
Facility Activations Developments And Closures [Line Items]
Net Carrying Value	15,895	16,266
Diamondback Correctional Facility
Facility Activations Developments And Closures [Line Items]
Net Carrying Value	38,346	39,729
Marion Adjustment Center
Facility Activations Developments And Closures [Line Items]
Net Carrying Value	11,047	11,351
Kit Carson Correctional Center
Facility Activations Developments And Closures [Line Items]
Net Carrying Value	52,757	54,041
Idle Facilities
Facility Activations Developments And Closures [Line Items]
Net Carrying Value	$ 132,691	$ 136,250