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Business Combinations (Details) (LCS Facilities, USD $)	0 Months Ended	3 Months Ended
	Feb. 17, 2015	Mar. 31, 2015	Feb. 18, 2015 bed	Feb. 17, 2015 party bed facility
Business Acquisition [Line Items]
Number of correctional and detention facilities acquired	8geo_BusinessCombinationNumberOfCorrectionalAndDetentionFacilitiesAcquired			8geo_BusinessCombinationNumberOfCorrectionalAndDetentionFacilitiesAcquired
Number of beds In facilities acquired (more than 6500)	6,500geo_NumberOfBeds		6,500geo_NumberOfBeds	6,500geo_NumberOfBeds
Contingent consideration arrangements, performance period		18 months
Aggregate amount of purchase price, maximum		$ 350,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Repayments of debt	298,000,000us-gaap_RepaymentsOfDebt
Consulting agreement, term	3 years
Number of principal parties with consulting agreements	3geo_NumberOfPrincipalPartiesWithConsultingAgreements			3geo_NumberOfPrincipalPartiesWithConsultingAgreements
Consulting agreement, annual amount	300,000geo_BusinessCombinationConsultingAgreementAnnualAmount			300,000geo_BusinessCombinationConsultingAgreementAnnualAmount
Customer Relationships
Business Acquisition [Line Items]
Identifiable intangible assets, useful life		20 years
General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related costs		$ 2,100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = geo_LCSFacilitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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- Definition

Business Combination, Consulting Agreement, Annual Amount

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Business Combination, Consulting Agreement, Term

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Business Combination, Contingent Consideration Arrangements, Performance Period

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- Definition

Business Combination, Number Of Correctional And Detention Facilities Acquired

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- Definition

Number Of Beds

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Number Of Principal Parties With Consulting Agreements

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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