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Goodwill and Other Intangible Assets, Net (Goodwill) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Changes in the Company's goodwill balances |  |  |
Beginning balance |  | $ 615,433 | $ 615,438
Acquisitions (net of dispositions) |  | 163,473 | 0
Foreign currency translation |  | 45 | (5)
Ending balance |  | 778,951 | 615,433
U.S. Corrections & Detention |  |  |
Changes in the Company's goodwill balances |  |  |
Beginning balance |  | 277,774 | 277,774
Acquisitions (net of dispositions) |  | 39,231 | 0
Foreign currency translation |  | 0 | 0
Ending balance |  | 317,005 | 277,774
GEO Community Services |  |  |
Changes in the Company's goodwill balances |  |  |
Beginning balance |  | 337,257 | 337,257
Acquisitions (net of dispositions) |  | 124,242 | 0
Foreign currency translation |  | 0 | 0
Ending balance |  | 461,499 | 337,257
International Services |  |  |
Changes in the Company's goodwill balances |  |  |
Beginning balance |  | 402 | 407
Acquisitions (net of dispositions) |  | 0 | 0
Foreign currency translation |  | 45 | (5)
Ending balance |  | $ 447 | $ 402
Assets Of One Of CEC Entities |  |  |
Goodwill [Line Items] |  |  |
Proceeds from sale of assets | $ 3,700 |  |
Goodwill decrease | $ 2,200 |  |

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