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Subsequent Events (Details) (CCR [Member])	May 01, 2012 track_miles
CCR [Member]
Subsequent Event [Line Items]
Track miles leased	26

X

- Definition

Track miles leased

+ References

No definition available.

+ Details

Name:	gwr_TrackMilesLeased
Namespace Prefix:	gwr_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration