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Commitments, Contingencies and Other (Details) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 19, 2017 claim | Sep. 20, 2017 claim | Sep. 09, 2017 claim | Dec. 19, 2017 claim | Jun. 30, 2018 USD ($) facility bed
Commitments and Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss |  |  |  |  | $ 19.6
Estimated construction capital project cost |  |  |  |  | 247.0
Cost already spent on existing capital projects |  |  |  |  | 171.0
Remaining capital required for capital projects |  |  |  |  | $ 76.0
Number of vacant beds at idle facilities marketed to potential customers | bed |  |  |  |  | 4,700
Number of marketed idle facilities | facility |  |  |  |  | 4
Property and Equipment |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Carrying values of idle facilities marketed to potential customers |  |  |  |  | $ 122.5
Pending Litigation | Immigration Detainees Against Company |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
New claims filed, number | claim |  |  |  | 3 |
WASHINGTON | Pending Litigation | Immigration Detainees Against Company |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
New claims filed, number | claim |  | 2 | 1 |  |
CALIFORNIA | Pending Litigation | Immigration Detainees Against Company |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
New claims filed, number | claim | 1 |  |  |  |

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