Commitments and Contingencies (Details Textual) In Millions, unless otherwise specified	12 Months Ended																0 Months Ended
	Dec. 31, 2014 USD ($) ServiceCenter renewal	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Workforce Subject to Collective Bargaining Arrangements	Dec. 31, 2014 Workforce Subject to Collective Bargaining Arrangements Expiring within One Year	May 29, 2013 Chief Executive Officer	May 28, 2013 Chief Executive Officer	Dec. 31, 2014 National Australia Bank Limited Ravenhall Non Recourse Debt USD ($)	Dec. 31, 2014 National Australia Bank Limited Ravenhall Non Recourse Debt AUD	Dec. 31, 2014 Construction Facility National Australia Bank Limited Ravenhall Non Recourse Debt USD ($)	Dec. 31, 2014 Construction Facility National Australia Bank Limited Ravenhall Non Recourse Debt AUD	Feb. 03, 2014 Facility Management Contracts Moore Haven Correctional Facility bed	Feb. 03, 2014 Facility Management Contracts Bay Correctonal Facility bed	Feb. 03, 2014 Facility Management Contracts Graceville Correctional Facility bed	Apr. 01, 2014 Facility Management Contracts McFarland CCF bed	Sep. 16, 2014 Facility Management Contracts Ravenhall bed	Sep. 10, 2014 Facility Management Contracts B.I. Incorporated Immigration and Customs Enforcement	Feb. 03, 2014 Contract Capacity Increase Rio Grande Detention Center bed	Feb. 02, 2014 Contract Capacity Increase Rio Grande Detention Center bed	Apr. 30, 2014 Contract Capacity Increase Adelanto Detention Facility bed	Dec. 19, 2014 Contract Capacity Increase Karnes County Civil Detention Center bed
Commitments and Contingencies [Line Items]
Operating agreements, number of renewal options	2
Operating agreements, renewal option, term	5 years
Leased ISAP service centers in connection with acquisition	47
Number of real estate properties	83
Minimum rent expense	$ 34.8	$ 35.9	$ 34.4
Concentration risk, percentage				24.00%	14.00%
Maximum performance award as percent of annual base salary						100.00%	150.00%
Facility, number of beds												985	985	1,884	260	1,300		1,900	1,500	1,300	532
Facility, additional number of beds																				640	626
Provision of case management and supervision services contract term																	5 years
Estimated construction capital project cost	235.2
Cost already spent on existing capital projects	61.6
Remaining capital required for capital projects	173.6
Capital contribution								93.8	115.0
Maximum borrowing capacity										$ 645.3	791.0