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Commitments, Contingencies and Other (Details) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) facility bed | Feb. 08, 2017 USD ($) | Oct. 22, 2014 detainee
Commitments and Contingencies [Line Items] |  |  |
Number of current and former civil immigration detainees | detainee |  |  | 9
Estimate of possible loss | $ 19.6 |  |
Estimated construction capital project cost | 243.9 |  |
Cost already spent on existing capital projects | 82.6 |  |
Remaining capital required for capital projects | $ 161.3 |  |
Number of vacant beds at idle facilities marketed to potential customers | bed | 5,400 |  |
Number of marketed idle facilities | facility | 5 |  |
Property and Equipment |  |  |
Commitments and Contingencies [Line Items] |  |  |
Carrying values of idle facilities marketed to potential customers | $ 137.3 |  |
Pending Litigation | Attorney General of Mississippi vs Company, Cornell Companies, Inc., Christopher B Epps And Cecil McCrory |  |  |
Commitments and Contingencies [Line Items] |  |  |
Contracts disputed |  | $ 256.0 |

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