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Debt Guarantees (Details)
 9 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2013
USD ($)
guarantee
Sep. 30, 2013
ZAR
Sep. 30, 2013
CAD
Dec. 31, 2012
USD ($)
Sep. 30, 2013
Geo Amey
USD ($)
Sep. 30, 2013
Geo Amey
GBP (£)
Oct. 03, 2013
Bank of England [Member]
Geo Amey
Line of Credit Facility [Line Items]              
Working Capital Line of Credit Issued to GEO Amey         $ 19,400,000 £ 12,000,000  
Remaining Guarantee under Letter of Credit 3,500,000 34,800,000          
Maximum Loan Amount under Stand by Facility 1,987,600.0 20,000,000          
Potential Estimated Exposure of tax obligations 2,400,000   2,500,000        
Liability Related to Potential Tax Exposure 2,200,000     2,000,000      
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees 8 8          
Letters of Guarantee Outstanding Relating to Performance Guarantees 11,300,000            
Ownership percentage in South African Custodial Services Pty. Limited         50.00% 50.00%  
Due from Affiliate, Noncurrent         20,500,000 12,700,000  
Line of Credit Facility, Increase, Accrued Interest         $ 1,200,000    
Basis spread on variable rate             0.50%