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Segments (Narrative) (Details) (Fiber optic cable systems [Member])
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3 Months Ended |
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Mar. 31, 2015
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Fiber optic cable systems [Member]
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| Segment Reporting Information [Line Items] | |
| Percentage of long-lived assets not in USA |
82.00%gncma_SegmentReportingInformationPercentageofLongLivedAssetsNotLocatedinCountryofOrigin / us-gaap_SubsegmentsAxis = gncma_FiberOpticCableSystemsMember |
| X | ||||||||||
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- Definition
Segment Reporting Information, Percentage of Long-Lived Assets Not Located in Country of Origin No definition available.
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- Details
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