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Financial Instruments (Details Textual) (MCFs Non Recourse Debt [Member], USD $) In Millions, unless otherwise specified	Jan. 01, 2012
MCFs Non Recourse Debt [Member]
Financial Instruments (Textual) [Abstract]
Principal amount of guaranteed investment related to debt service reserve fund	$ 23.9
Guaranteed investment related to bond fund payment	$ 9.9

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- Details

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Period Type:	duration

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- Definition

Guaranteed investment related to bond fund payment.

+ References

No definition available.

+ Details

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Namespace Prefix:	geo_
Data Type:	xbrli:monetaryItemType
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- Definition

Principal amount of guaranteed investment related to debt service reserve fund.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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