XML 76 R61.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Shareholders' Equity - Common Stock, Distributions, Prospectus Supplement and Preferred Stock (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 13, 2017 USD ($) shares | Mar. 08, 2017 shares | Mar. 07, 2017 $ / shares shares | Dec. 31, 2017 vote $ / shares shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 2015 shares | Nov. 10, 2014 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of votes per each share | vote |  |  |  | 1 |  |  |
Common stock, voting rights |  |  |  | one vote per share |  |  |
Minimum % of REIT taxable income to be paid as dividend annually |  |  |  | 90.00% |  |  |
Issuance of common stock under prospectus supplement, shares | 10,350,000 |  | 9,000,000 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Sale of stock, price per share (in dollars per share) | $ / shares |  |  | 27.80 |  |  |  |
Proceeds from issuance of common stock | $ | $ 288,100,000 |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  | 30,000,000 | 30,000,000 |  |
Underwriters |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares |  |  | $ 26.70 |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ | $ 37,600,000 |  |  |  |  |  |
Over-Allotment Option | Underwriters |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of common stock under prospectus supplement, shares |  | 1,350,000 |  |  |  |  |
Option to exercise additional purchase of stock, term |  |  | 30 days |  |  |  |
Prospectus Supplement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of common stock under prospectus supplement, shares |  |  |  | 0 | 0 | 0 |
Maximum common stock value authorized under prospectus supplement | $ |  |  |  |  |  |  | $ 150,000,000

X
- Definition Common Stock, Voting Rights, Number Of Votes Per Each Share + References No definition available. + Details
Name: | geo_CommonStockVotingRightsNumberOfVotesPerEachShare
Namespace Prefix: | geo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition MaximumCommonStockValueAuthorizedUnderProspectusSupplement + References No definition available. + Details
Name: | geo_MaximumCommonStockValueAuthorizedUnderProspectusSupplement
Namespace Prefix: | geo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum % of REIT taxable income (determined without regard to the dividends paid deduction and by excluding net capital gain) required to be paid out annually dividends. + References No definition available. + Details
Name: | geo_MinimumPercentOfREITTaxableIncomeToBePaidAsDividendAnnually
Namespace Prefix: | geo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale Of Stock, Option To Exercise Additional Purchase Of Stock, Term + References No definition available. + Details
Name: | geo_SaleOfStockOptionToExerciseAdditionalPurchaseOfStockTerm
Namespace Prefix: | geo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 + Details
Name: | us-gaap_CommonStockVotingRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CounterpartyNameAxis=geo_UnderwritersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=geo_ProspectusSupplementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |