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Debt (Guarantees) (Details) £ in Millions, CAD in Millions, AUD in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) guarantee | Dec. 31, 2017 GBP (£) guarantee | Dec. 31, 2017 AUD guarantee | Dec. 31, 2017 CAD guarantee | Dec. 31, 2017 ZAR guarantee | Dec. 31, 2016 USD ($)
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 | 10 | 10 | 10 | 10 | 10 |
Letters of guarantee outstanding relating to performance guarantees | $ 15,900,000 |  |  |  |  |
SACS |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum exposure, undiscounted | 200,000 |  |  |  | ZAR 2,400,000 |
Maximum loan amount under stand by facility to SACS | 1,600,000.0 |  |  |  | ZAR 20,000,000 |
Canada Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Potential estimated exposure of tax obligations | CAD |  |  |  | CAD 1.1 |  |
Revolver | Letter of credit | Ravenhall |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum exposure, undiscounted |  |  | AUD 100 |  |  | $ 78,100,000
Other Noncurrent Assets | GEO Amey |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Due from joint venture, current | $ 1,700,000 | £ 1.3 |  |  |  |

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