Name:	gwr_EquityMethodInvestmentSummarizedFinancialInformationAmountofNetIncomeLossAttributabletoNoncontrollingInterest.
Namespace Prefix:	gwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of income tax expense (benefit) reported by an equity method investment of the entity.

No definition available.

Name:	gwr_EquityMethodInvestmentSummarizedFinancialInformationIncomeTaxExpenseBenefit
Namespace Prefix:	gwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of interest expense reported by an equity method investment of the entity.

No definition available.

Name:	gwr_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense
Namespace Prefix:	gwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of net income (loss) attributable to parent reported by an equity method investment of the entity.

No definition available.

Name:	gwr_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossAttributabletoParent
Namespace Prefix:	gwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of operating expenses reported by an equity method investment of the entity.

No definition available.

Name:	gwr_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses
Namespace Prefix:	gwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of operating income (loss) reported by an equity method investment of the entity.

No definition available.

Name:	gwr_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss
Namespace Prefix:	gwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of other income reported by an equity method investment of the entity.

No definition available.

Name:	gwr_EquityMethodInvestmentSummarizedFinancialInformationOtherIncome
Namespace Prefix:	gwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of income (loss) from continuing operations before extraordinary items reported by an equity method investment of the entity.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph bb

-Article 1

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph g

-Subparagraph 1, 2

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph w

-Article 1

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33908-111571

Name:	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of net income (loss) reported by an equity method investment of the entity.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(g))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 28

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph bb

-Article 1

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph g

-Subparagraph 1, 2

-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

No definition available.