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Acquisition - Pro Forma Revenue and Net Earnings (Details) - GCI Liberty Inc $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($) $ / shares
Business Acquisition [Line Items] |
Revenue | $ 238,383
Net earnings (loss) | 12,318
Net earnings (loss) attributable to Liberty Broadband shareholders | $ 12,343
Basic net earnings (loss) attributable to Series A, Series B and Series C Liberty Broadband shareholders per common share (in dollars per share) | $ / shares | $ 0.07
Diluted net earnings (loss) attributable to Series A, Series B and Series C Liberty Broadband shareholders per common share (in dollars per share) | $ / shares | $ 0.07

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