Annual report pursuant to Section 13 and 15(d)

Acquisition (Pro Forma Revenue and Net Earnings) (Details)

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Acquisition (Pro Forma Revenue and Net Earnings) (Details) - HoldCo - GCI Liberty Inc - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Revenue $ 899,210 $ 918,726
Net earnings (loss) (872,306) 713,377
Net earnings (loss) attributable to GCI Liberty shareholders $ (871,839) $ 713,882
Basic net earnings (loss) attributable to Series A and Series B GCI Liberty, Inc. shareholders per common share (in dollars per share) $ (8.08) $ 6.55
Diluted net earnings (loss) attributable to Series A and Series B GCI Liberty, Inc. shareholders per common share (in dollars per share) $ (8.08) $ 6.55