Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Narratives) (Details)

v3.3.1.900
Stockholders' Equity (Narratives) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
vote
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
Dec. 31, 2013
USD ($)
$ / shares
Share-Based Compensation      
Fair value assumptions, method used The fair value of restricted stock awards is determined based on the number of shares granted and the quoted price of our common stock.      
Share-based compensation expense $ 10.9 $ 8.4 $ 6.6
Unrecognized share-based compensation expense 9.6    
GCI 401(k) Plan      
Matching contributions $ 9.8 $ 9.1 $ 8.2
Class A Common Stock      
Common Stock      
Common stock, voting rights, number of votes | vote 1    
Stock conversion ratio 1    
Class B Common Stock      
Common Stock      
Common stock, voting rights, number of votes | vote 10    
Restricted Stock      
Share-Based Compensation      
Weighted average period for recognition of unvested shares 1 year 10 months 2 days    
Stock Options      
Share-Based Compensation      
Vesting period 5 years    
Expiration period 10 years    
Maximum | Restricted Stock      
Share-Based Compensation      
Vesting period 3 years    
Stock Option Plan [Member] | Class A Common Stock      
Share-Based Compensation      
Number of shares authorized | shares 15,700,000.0    
Number of shares available for grant | shares 2,100,000    
Stock Option Plan [Member] | Restricted Stock      
Share-Based Compensation      
Granted (USD per share) | $ / shares $ 15.06 $ 10.04 $ 8.30
Fair value of awards vesting $ 17.0 $ 8.5 $ 5.5
Stock Option Plan [Member] | Stock Options      
Share-Based Compensation      
Intrinsic values of options exercised $ 3.8 $ 0.1 $ 0.2