Idled Facilities and Respective Carrying Values Excluding Equipment and Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Facility	Dec. 31, 2013
Facility Activations Developments And Closures [Line Items]
Design Capacity	84,500
Prairie Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	1,600
Date Idled	2010
Net Carrying Value	$ 18,748	$ 19,366
Huerfano County Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	752
Date Idled	2010
Net Carrying Value	19,033	19,800
Diamondback Correctional Facility
Facility Activations Developments And Closures [Line Items]
Design Capacity	2,160
Date Idled	2010
Net Carrying Value	44,480	44,223
Otter Creek Correctional Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	656
Date Idled	2012
Net Carrying Value	24,089	24,805
Marion Adjustment Center
Facility Activations Developments And Closures [Line Items]
Design Capacity	826
Date Idled	2013
Net Carrying Value	12,978	13,429
Total Idle Facilities
Facility Activations Developments And Closures [Line Items]
Design Capacity	5,994
Net Carrying Value	$ 119,328	$ 121,623