Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v2.4.1.9
Basis of Presentation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 1 Months Ended
Dec. 10, 2014
Nov. 04, 2014
Mar. 31, 2015
Jan. 09, 2015
Broadband Spin-Off Distribution Ratio   0.25lbrda_Lbrda_spinOffDistributionRatio    
Subscription rights distribution ratio 0.20lbrda_SubscriptionRightsDistributionRatio      
Stock Issued During Period, Shares, New Issues   85,761,332us-gaap_StockIssuedDuringPeriodSharesNewIssues    
Subscription Rights Discount to Market Percentage 20.00%lbrda_SubscriptionRightsDiscountToMarketPercentage      
Subscription Rights Period of Time for Calculation of Subscription Price 20 days      
Related Party Transaction, Amounts of Transaction     $ 891us-gaap_RelatedPartyTransactionAmountsOfTransaction  
Cash received from rights offering     $ 697,309lbrda_CashReceivedFromRightsOffering  
Class C common stock | Rights Offering [member]        
Stock Issued During Period, Shares, New Issues       17,277,224us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_StatementScenarioAxis
= lbrda_RightsOfferingMember
Share Price 40.36us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_StatementScenarioAxis
= lbrda_RightsOfferingMember