| **Selected Quarterly Financial Data (Unaudited) (Tables)** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| **Quarterly Financial Information Disclosure [Abstract]**  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Schedule of Quarterly Financial Information                | The following is a summary of unaudited quarterly results of operations for the years ended December 31, 2014 and 2013 including the impact of the immaterial error correction adjustments discussed above (amounts in thousands, except per share amounts): As of March 31, 2014 As of June 30, 2014 As of September 30, 2014  Previously reportedCorrectionAs adjusted Previously reportedCorrectionAs adjusted Previously reportedCorrectionAs adjusted Deferred income tax liability$158,104981159,085 166,6653,209169,874 160,7995,806166,605 Total liabilities$1,550,9899811,551,970 1,595,6833,2091,598,892 1,556,3945,8061,562,200 Retained earnings$119,111(981)118,130 127,266(3,209)124,057 139,778(5,806)133,972 Total GCI stockholders' equity$161,380(981)160,399 171,748(3,209)168,539 185,150(5,806)179,344 Total stockholders' equity$458,811(981)457,830 465,461(3,209)462,252 482,295(5,806)476,489               First Quarter Second Quarter Third QuarterFourth Quarter2014Previously reportedCorrectionAs adjusted Previously reportedCorrectionAs adjusted Previously reportedCorrectionAs adjustedTotal revenues$216,283—216,283 224,399—224,399 240,725—240,725228,791Operating income$30,265—30,265 38,414—38,414 49,336—49,33625,547Income tax expense$(215)(981)(1,196) (127)(2,228)(2,355) (2,481)(2,597)(5,078)(1,400)Net income$11,742(981)10,761 19,068(2,228)16,840 28,444(2,597)25,8475,796Net income (loss) attributable to GCI$2,121(981)1,140 8,155(2,228)5,927 12,512(2,597)9,915(9,425)Basic net income (loss) attributable to GCI per common share$0.05(0.02)0.03 0.20(0.06)0.14 0.30(0.06)0.24(0.24)Diluted net income (loss) attributable to GCI per common share$0.05(0.02)0.03 0.20(0.06)0.14 0.30(0.06)0.24(0.24)             2013First QuarterSecond QuarterThird Quarter Fourth Quarter       Total revenues$186,216189,661217,943 217,828       Operating income$23,06025,69538,684 25,423       Net income (loss) attributable to GCI$3,2444,1808,905 (6,923)       Basic net income (loss) attributable to GCI per common share$0.080.100.22 (0.17)       Diluted net income (loss) attributable to GCI per common share$0.080.100.22 (0.17)        |

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| - Definition
Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306
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