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Acquisition - Acquisition Consideration (Details) shares in Thousands, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Dec. 18, 2020 USD ($) shares | Mar. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |
Less: Fair value of Liberty Broadband shares attributable to share repurchase |  | $ (738,411)
Series C common stock | GCI Liberty Inc | Liberty Broadband Corporation |  |
Business Acquisition [Line Items] |  |
Shares owned | shares | 42,700 |
Series C common stock | Common stock |  |
Business Acquisition [Line Items] |  |
Less: Fair value of Liberty Broadband shares attributable to share repurchase |  | $ (48)
GCI Liberty Inc |  |
Business Acquisition [Line Items] |  |
Total fair value of consideration | $ 10,002,811 |
Less: Fair value of Liberty Broadband shares attributable to share repurchase | (6,738,609) |
Total fair value of consideration attributable to business combination | 3,264,202 |
Less: Fair value of share-based payment replacement awards accounted for as liability awards | (1,309) |
Total fair value of acquisition consideration to be allocated | $ 3,059,949 |
Business combination shares issued ratio | 0.580 |
Conversion ratio | 1 |
GCI Liberty Inc | Share based payments awards |  |
Business Acquisition [Line Items] |  |
Total fair value of consideration | $ 104,683 |
GCI Liberty Inc | Preferred Stock |  |
Business Acquisition [Line Items] |  |
Total fair value of consideration | 202,944 |
GCI Liberty Inc | Series C and B Common Stock | Common stock |  |
Business Acquisition [Line Items] |  |
Total fair value of consideration | $ 9,695,184 |
GCI Liberty Inc | Series C common stock |  |
Business Acquisition [Line Items] |  |
Number of shares issued | shares | 61,300 |
GCI Liberty Inc | Series B common stock |  |
Business Acquisition [Line Items] |  |
Number of shares issued | shares | 98 |

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