Quarterly report pursuant to Section 13 or 15(d)

Business and Summary of Significant Accounting Principles (Diluted EPS calculations) (Details)

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Business and Summary of Significant Accounting Principles (Diluted EPS calculations) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Class of Stock [Line Items]    
Allocation of undistributed earnings for basic computation $ 3,244 $ 1,429
Common Stock - Class A [Member]
   
Class of Stock [Line Items]    
Allocation of undistributed earnings for basic computation 2,996 1,321
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares 248 108
Effect of share based compensation that may be settled in cash or shares (34) (100)
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares outstanding 0 0
Net income adjusted for allocation of undistributed earnings and effect of share based compensation that may be settled in cash or shares 3,210 1,329
Number of shares used in basic computation 38,264 38,741
Conversion of Class B to Class A common shares outstanding 3,167 3,171
Unexercised stock options 173 272
Effect of share based compensation that may be settled in cash or shares 91 158
Number of shares used in per share computations 41,695 42,342
Diluted net income attributable to General Communication, Inc. common stockholders per common share $ 0.08 $ 0.03
Common Stock - Class B [Member]
   
Class of Stock [Line Items]    
Allocation of undistributed earnings for basic computation 248 108
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares 0 0
Effect of share based compensation that may be settled in cash or shares 0 0
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares outstanding (4) (9)
Net income adjusted for allocation of undistributed earnings and effect of share based compensation that may be settled in cash or shares $ 244 $ 99
Number of shares used in basic computation 3,167 3,171
Conversion of Class B to Class A common shares outstanding 0 0
Unexercised stock options 0 0
Effect of share based compensation that may be settled in cash or shares 0 0
Number of shares used in per share computations 3,167 3,171
Diluted net income attributable to General Communication, Inc. common stockholders per common share $ 0.08 $ 0.03