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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Selected Quarterly Financial Data (Unaudited) [Abstract]  
ScheduleOfQuarterlyFinancialInformationTableTextBlock
   FirstSecondThirdFourth
 QuarterQuarterQuarterQuarter
2012     
Total revenues$ 171,907 176,104 178,494 183,676
Operating income$ 19,685 24,633 25,392 19,270
Net income attributable to GCI$ 1,429 3,982 3,700 562
Basic net income attributable to GCI per common share$ 0.03 0.10 0.090.01
Diluted net income attributable to GCI per common share1$ 0.03 0.09 0.090.01
       
2011     
Total revenues$ 164,777 168,089 177,703 168,812
Operating income$ 20,262 22,300 31,933 16,030
Net income (loss) attributable to GCI2$ 1,399 (2,043) 7,239 (870)
Basic net income (loss) attributable to GCI per common share $ 0.03 (0.04) 0.16 (0.02)
Diluted net income (loss) attributable to GCI per common share1,2$ 0.02 (0.04) 0.15 (0.02)
       
1Due to rounding, the sum of quarterly diluted net income attributable to GCI per common share amounts does not agree to total year diluted net income attributable to GCI per common share.
2Due to the immaterial error correction discussed in Note 1(af), some amounts are revised from prior period financial statements.