Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value (Details 2)

v2.4.1.9
Assets and Liabilities Measured at Fair Value (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Realized and Unrealized Gains (Losses) on Financial Instruments    
Realized and unrealized gains (losses) $ (1,329)us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings $ (12,702)us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings
Charter | Warrants    
Realized and Unrealized Gains (Losses) on Financial Instruments    
Realized and unrealized gains (losses)   (15,212)us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lbrda_CharterCommunicationsMember
Time Warner | Investment and financial instruments [member]    
Realized and Unrealized Gains (Losses) on Financial Instruments    
Realized and unrealized gains (losses) $ (1,329)us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= lbrda_InvestmentAndFinancialInstrumentsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lbrda_TimeWarnerCableIncMember 		$ 2,510us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= lbrda_InvestmentAndFinancialInstrumentsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lbrda_TimeWarnerCableIncMember