| Acquisition - Pro Forma Revenue and Net Earnings (Details) - GCI Liberty Inc - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 
|---|---|---|
| Jun. 30, 2020 | Jun. 30, 2020 | |
| Business Acquisition [Line Items] | ||
| Revenue | $ 227,380 | $ 465,763 | 
| Net earnings (loss) | (5,269) | 7,049 | 
| Net earnings (loss) attributable to Liberty Broadband shareholders | $ (5,243) | $ 7,100 | 
| Basic net earnings (loss) attributable to Series A, Series B and Series C Liberty Broadband shareholders per common share (in dollars per share) | $ (0.03) | $ 0.04 | 
| Diluted net earnings (loss) attributable to Series A, Series B and Series C Liberty Broadband shareholders per common share (in dollars per share) | $ (0.03) | $ 0.04 | 
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- Definition Business Acquisition, Pro Forma Net Income (Loss) Attributable To Common Shareholders No definition available. 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Details 
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