Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

v2.4.1.9
Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employer cash contribution $ 1.5us-gaap_DefinedContributionPlanCostRecognized $ 1.6us-gaap_DefinedContributionPlanCostRecognized $ 2.0us-gaap_DefinedContributionPlanCostRecognized
TruePosition      
Company matching contribution (as a percent) 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember 		   
Employee salary eligible for matching contributions (as a percent) 10.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ dei_LegalEntityAxis
= lbrda_TruePositionIncMember 		   
Skyhook      
Company matching contribution (as a percent) 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ dei_LegalEntityAxis
= lbrda_SkyhookWirelessIncMember 		   
Employee salary eligible for matching contributions (as a percent) 8.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ dei_LegalEntityAxis
= lbrda_SkyhookWirelessIncMember