Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

v2.4.1.9
Stock-Based Compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Nov. 03, 2014
Awards    
Options    
Outstanding beginning balance (in shares)   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
Outstanding ending balance (in shares)   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
Transitional Plan | Awards    
Stock Based Compensation    
Number of authorized shares 2,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_TransitionalStockAdjustmentPlanMember
 
2014 Plan | Awards    
Stock Based Compensation    
Number of authorized shares 8,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
 
Fair value assumptions    
Dividend rate 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
 
2014 Plan | Awards | Class A common stock    
Options    
Broadband Spin-Off adjustment (in shares) 846,000lbrda_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdjustedAtSpinOff
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Exercised (in shares) (39,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Outstanding ending balance (in shares) 807,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Number of awards exercisable (in shares) 680,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
WAEP Broadband Spin-Off adjustment (in dollars per share) 32.21lbrda_ShareBasedCompensationArrangmentsByShareBasedPaymentAwardOptionsAdjustedForSpinOff
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
WAEP options exercised (in dollars per share) 32.16us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
WAEP Outstanding ending balance (in dollars per share) 32.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
WAEP options exercisable (in dollars per share) 31.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted average remaining contractual life outstanding 4 years 2 months 12 days  
Weighted average remaining contractual life exercisable 4 years 1 month 6 days  
Aggregate intrinsic value outstanding 14,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Aggregate intrinsic value exercisable 12,000,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
2014 Plan | Awards | Class C common stock    
Options    
Broadband Spin-Off adjustment (in shares) 1,709,000lbrda_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdjustedAtSpinOff
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
Options granted (in shares) 1,507,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
Exercised (in shares) (79,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
Outstanding ending balance (in shares) 3,137,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
Number of awards exercisable (in shares) 1,373,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
WAEP Broadband Spin-Off adjustment (in dollars per share) 32.22lbrda_ShareBasedCompensationArrangmentsByShareBasedPaymentAwardOptionsAdjustedForSpinOff
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
WAEP Options granted (in dollars per share) 48.10us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
WAEP options exercised (in dollars per share) 32.50us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
WAEP Outstanding ending balance (in dollars per share) 39.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
WAEP options exercisable (in dollars per share) 31.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
Weighted average remaining contractual life outstanding 7 years  
Weighted average remaining contractual life exercisable 4 years 1 month 6 days  
Aggregate intrinsic value outstanding 31,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
Aggregate intrinsic value exercisable 25,000,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
 
2014 Plan | Options    
Stock Based Compensation    
Distribution ratio considered to determine exercise price and number of shares (as a percent) 0.25%lbrda_ShareBasedCompensationArrangementByShareBasedPaymentAwardDividendRatioConsideredToDetermineExercisePriceAndNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
 
Options    
Aggregate intrinsic value exercises 1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
 
2014 Plan | Options | Class B common stock    
Options    
Outstanding ending balance (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
2014 Plan | Options | Class C common stock | Tranche Three    
Stock Based Compensation    
Vesting period 2 years  
Weighted average grant date fair value (in dollars per share) 13.62us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember
 
Options    
Options granted (in shares) 7,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember
 
2014 Plan | Options | Class C common stock | CEO    
Stock Based Compensation    
Weighted average grant date fair value (in dollars per share) 16.80us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
 
Options    
Options granted (in shares) 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
 
2014 Plan | Options | Class C common stock | CEO | Tranche One    
Stock Based Compensation    
Vesting percentage 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
 
2014 Plan | Options | Class C common stock | CEO | Tranche Two    
Stock Based Compensation    
Vesting percentage 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
 
2014 Plan | Minimum | Awards    
Stock Based Compensation    
Vesting period 4 years  
Term of awards 7 years  
Fair value assumptions    
Expected term 5 years 1 month 6 days  
Volatility rate 28.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
2014 Plan | Maximum | Awards    
Stock Based Compensation    
Vesting period 5 years  
Term of awards 10 years  
Fair value assumptions    
Expected term 7 years 3 months 18 days  
Volatility rate 28.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= lbrda_EmployeeStockOptionsAndStockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= lbrda_OmnibusIncentivePlan2014Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember