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Variable Interest Entities (Details Textual) | 1 Months Ended | 3 Months Ended |  |  |  |  |  | 3 Months Ended |  | 1 Months Ended |  |  |
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Feb. 28, 2011 director | Mar. 31, 2013 USD ($) bed | Dec. 31, 2012 USD ($) | Mar. 31, 2013 South Texas Detention Complex Carrying Value USD ($) | Mar. 31, 2013 Variable Interest Entity, Primary Beneficiary USD ($) | Dec. 31, 2012 Variable Interest Entity, Primary Beneficiary USD ($) | Mar. 31, 2013 Variable Interest Entity, Primary Beneficiary South Texas Detention Complex Carrying Value Subordinate Notes STLDC USD ($) | Dec. 31, 2012 Variable Interest Entity, Primary Beneficiary South Texas Detention Complex Carrying Value Subordinate Notes STLDC USD ($) | Mar. 31, 2013 South African Custodial Services Pty Limited USD ($) | Dec. 31, 2012 South African Custodial Services Pty Limited USD ($) | Feb. 28, 2011 Geo Amey GBP (£) | Mar. 31, 2013 Geo Amey USD ($) | Mar. 31, 2013 Geo Amey GBP (£) | Dec. 31, 2012 Geo Amey USD ($) | Feb. 02, 2012 Geo Amey GBP (£)
Variable Interest Entities (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds in detention Complex |  | 1,904 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of taxable revenue bonds |  |  |  | $ 49,500,000 |  |  |  |  |  |  |  |  |  |  |
Term period of non-recourse bonds of the Company |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  | 1,680,165,000 | 1,687,159,000 |  | 25,692,000 | 25,840,000 | 25,700,000 | 25,800,000 |  |  |  |  |  |  |
Ownership percentage in South African Custodial Services Pty. Limited |  | 50.00% |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Life term of contract |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |
Reduction of government guarantee in case of default |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  | 7,600,000 | 7,800,000 |  | (4,200,000) |  | (4,100,000) |
Not consolidated owned joint venture in United kingdom |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Issued share capital |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |
Issued share capital divided in no. of share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100
Par value of share issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 1
Directors appointed to board by each party | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lines of credit provided by GEO UK and Amey |  | 18,300,000 |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 18,600,000 | £ 12,200,000 |  |

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