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Summary of Business Organization, Operations and Significant Accounting Policies - Revenue Recognition (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) bed contract | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Domestic performance based revenues percent of consolidated revenues |  |  |  |  |  |  |  |  | 1.00% |  |
Performance obligation expected timing of satisfaction |  |  |  |  |  |  |  |  | P1Y |  |
Performance obligation, payment required, period |  |  |  |  |  |  |  |  | 30 days |  |
Total Revenues | $ 599,430,000 | $ 583,530,000 | $ 583,509,000 | $ 564,917,000 | $ 568,977,000 | $ 566,759,000 | $ 577,070,000 | $ 550,614,000 | $ 2,331,386,000 | $ 2,263,420,000 | $ 2,179,490,000
Owned and Leased: Corrections & Detention |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 1,110,749,000 | 1,055,254,000 | 1,042,613,000
Owned and Leased: Community-based |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 170,805,000 | 149,619,000 | 72,953,000
Owned and Leased: Youth Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 91,824,000 | 88,184,000 | 85,235,000
Managed Only |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 641,079,000 | 582,091,000 | 490,027,000
Facility Construction and Design |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 4,226,000 | 115,404,000 | 252,401,000
Interest income, effective interest rate |  |  |  |  |  |  |  |  | 8.97% |  |
Non-residential Services and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 312,703,000 | 272,868,000 | 236,261,000
U.S. Corrections & Detention |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 1,492,973,000 | 1,438,044,000 | 1,375,277,000
U.S. Corrections & Detention | Owned and Leased: Corrections & Detention |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 1,110,749,000 | 1,055,254,000 | 1,042,613,000
U.S. Corrections & Detention | Owned and Leased: Community-based |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
U.S. Corrections & Detention | Owned and Leased: Youth Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
U.S. Corrections & Detention | Managed Only |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 382,224,000 | 382,790,000 | 332,664,000
U.S. Corrections & Detention | Facility Construction and Design |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
U.S. Corrections & Detention | Non-residential Services and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
GEO Care |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 580,313,000 | 514,166,000 | 394,449,000
GEO Care | Owned and Leased: Corrections & Detention |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
GEO Care | Owned and Leased: Community-based |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 170,805,000 | 149,619,000 | 72,953,000
GEO Care | Owned and Leased: Youth Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 91,824,000 | 88,184,000 | 85,235,000
GEO Care | Managed Only |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 4,981,000 | 3,495,000 | 0
GEO Care | Facility Construction and Design |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
GEO Care | Non-residential Services and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 312,703,000 | 272,868,000 | 236,261,000
International |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 253,874,000 | 195,806,000 | 157,363,000
International | Owned and Leased: Corrections & Detention |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
International | Owned and Leased: Community-based |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
International | Owned and Leased: Youth Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
International | Managed Only |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 253,874,000 | 195,806,000 | 157,363,000
International | Facility Construction and Design |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
International | Non-residential Services and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Facility Construction and Design |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 4,226,000 | 115,404,000 | 252,401,000
Facility Construction and Design | Owned and Leased: Corrections & Detention |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Facility Construction and Design | Owned and Leased: Community-based |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Facility Construction and Design | Owned and Leased: Youth Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Facility Construction and Design | Managed Only |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Facility Construction and Design | Facility Construction and Design |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 4,226,000 | 115,404,000 | 252,401,000
Facility Construction and Design | Non-residential Services and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 0
Department Of Justice, State Of Victoria | Facility Construction and Design |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 0 |  |
Number of contracts | contract |  |  |  |  |  |  |  |  | 1 |  |
Number of beds in detention facility | bed |  |  |  |  |  |  |  |  | 1,300 |  |
Facility operation contract term |  |  |  |  |  |  |  |  | 25 years |  |

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