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Debt Guarantees (Details) In Millions, unless otherwise specified | 3 Months Ended |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 USD ($) guarantees | Mar. 31, 2013 ZAR | Mar. 31, 2013 CAD | Dec. 31, 2012 USD ($) | Mar. 31, 2013 Geo Amey USD ($) | Mar. 31, 2013 Geo Amey GBP (£)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Remaining Guarantee under Letter of Credit | $ 3.8 | 34.8 |  |  |  |
Maximum Loan Amount under Stand by Facility | 2.2 | 20.0 |  |  |  |
Potential Estimated Exposure of tax obligations | 2.5 |  | 2.5 |  |  |
Liability Related to Potential Tax Exposure | 2.2 |  |  | 2.0 |  |
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees | 8 | 8 |  |  |  |
Letters of Guarantee Outstanding Relating to Performance Guarantees | 12.7 |  |  |  |  |
Variable Interest Entity Ownership Percentage in Joint Venture | 50.00% | 50.00% |  |  |  |
Working Capital Line of Credit | 18.3 |  |  |  |  | 12.0
Line of Credit Facility, Amount Outstanding |  |  |  |  | 18.6 | 12.2
Line of Credit Facility, Increase, Accrued Interest |  |  |  |  | $ 0.4 |

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- Definition Letters of guarantee outstanding relating to performance guarantees. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Increase for accrued, but unpaid interest on the credit facility for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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