Quarterly report pursuant to Section 13 or 15(d)

Earnings (Loss) Per Common Share (Diluted Net Income (Loss) Per Share) (Details)

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Earnings (Loss) Per Common Share (Diluted Net Income (Loss) Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Common Stock - Class A [Member]        
Numerator [Abstract]        
Undistributed income (loss) allocable to common stockholders for basic computation $ 2,967 $ (14,330) $ 3,934 $ (32,048)
Reallocation of undistributed earnings (loss) as a result of conversion of Class B to Class A shares 281 (1,297) 370 (2,848)
Reallocation of undistributed earnings as a result of conversion of dilutive securities 189 0 304 0
Effect of derivative instruments that may be settled in cash or shares (3,834) 0 (6,501) 0
Effect of share based compensation that may be settled in cash or shares (39) 0 (62) 0
Undistributed net income (loss) adjusted for allocation of undistributed earnings (loss) and effect of contracts that may be settled in cash or shares $ (436) $ (15,627) $ (1,955) $ (34,896)
Denominator [Abstract]        
Number of shares used in basic computation 33,308 34,887 33,502 35,548
Conversion of Class B to Class A common shares outstanding 3,155 3,159 3,155 3,159
Effect of derivative instruments that may be settled in cash or shares 611 0 744 0
Effect of share based compensation that may be settled in cash or shares 26 0 26 0
Number of shares used in per share computation 37,100 38,046 37,427 38,707
Diluted net loss attributable to GCI common stockholders per common share $ (0.01) $ (0.41) $ (0.05) $ (0.90)
Common Stock - Class B [Member]        
Numerator [Abstract]        
Undistributed income (loss) allocable to common stockholders for basic computation $ 281 $ (1,297) $ 370 $ (2,848)
Reallocation of undistributed earnings (loss) as a result of conversion of Class B to Class A shares 0 0 0 0
Reallocation of undistributed earnings as a result of conversion of dilutive securities (319) 0 (536) 0
Effect of derivative instruments that may be settled in cash or shares 0 0 0 0
Effect of share based compensation that may be settled in cash or shares 0 0 0 0
Undistributed net income (loss) adjusted for allocation of undistributed earnings (loss) and effect of contracts that may be settled in cash or shares $ (38) $ (1,297) $ (166) $ (2,848)
Denominator [Abstract]        
Number of shares used in basic computation 3,155 3,159 3,155 3,159
Conversion of Class B to Class A common shares outstanding 0 0 0 0
Effect of derivative instruments that may be settled in cash or shares 0 0 0 0
Effect of share based compensation that may be settled in cash or shares 0 0 0 0
Number of shares used in per share computation 3,155 3,159 3,155 3,159
Diluted net loss attributable to GCI common stockholders per common share $ (0.01) $ (0.41) $ (0.05) $ (0.90)