Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Details)

v2.4.1.9
Related Party Transactions (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Aug. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Related party transactions        
Payments to Liberty $ (891,000)us-gaap_RelatedPartyTransactionAmountsOfTransaction      
Liberty | TruePosition        
Related party transactions        
Payable (receivable), beginning balance     (5,953,000)us-gaap_RelatedPartyTransactionDueFromToRelatedPartyCurrent
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
 
Cost and expenses charged 1,252,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
     
Transfer of related party receivable to (from) note receivable 5,306,000lbrda_RelatedPartyTransferOfRelatedPartyReceivableToFromNoteReceivable
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
     
Payments to Liberty (893,000)us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
     
(Receivable) payable, ending balance 9,871,000us-gaap_RelatedPartyTransactionDueFromToRelatedPartyCurrent
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
  (5,953,000)us-gaap_RelatedPartyTransactionDueFromToRelatedPartyCurrent
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
 
Liberty | TruePosition | Tax sharing agreement        
Related party transactions        
Amounts due under the tax-sharing arrangement 10,159,000lbrda_RelatedPartyAmountsDueUnderTaxSharingArrangement
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionAxis
= lbrda_TaxSharingAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
     
Liberty | TruePosition | Intercompany note arrangment [member]        
Related party transactions        
Outstanding note receivable $ 0us-gaap_NotesReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionAxis
= lbrda_IntercompanyNoteArrangmentMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
    $ 0us-gaap_NotesReceivableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionAxis
= lbrda_IntercompanyNoteArrangmentMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
Three-month LIBOR | Liberty | TruePosition        
Related party transactions        
Interest rate basis   three-month LIBOR    
Basis spread on variable rate   2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lbrda_LibertyMediaCorporationAndItsSubsidiariesMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember