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Debt (Guarantees) (Details) £ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) guarantee | Dec. 31, 2018 AUD ($) guarantee | Dec. 31, 2018 CAD ($) guarantee | Dec. 31, 2018 ZAR (R) guarantee | Dec. 31, 2017 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest entity ownership percentage in joint venture | 50.00% |  |  |  |  |
GEO Amey |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Lines of credit | $ 12,000,000 |  |  |  |  |
Ravenhall |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees | guarantee |  | 8 | 8 | 8 | 8 |
Letters of guarantee outstanding relating to performance guarantees |  | $ 11,500,000 |  |  |  |
SACS |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum loan amount under stand by facility to SACS |  | 1,400,000.0 |  |  | R 20,000,000 |
Line of credit facility, amount outstanding |  | $ 0 |  |  |  |
Canada Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Potential estimated exposure of tax obligations |  |  |  | $ 1.1 |  |
Revolver | Letter of credit | Ravenhall |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum exposure, undiscounted | 70,600,000 |  | $ 100 |  |  |
Other Noncurrent Assets | GEO Amey |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Due from joint venture, current | $ 1,700,000 |  |  |  |  | £ 1.3

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