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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]    
Renewable terms of FCC broadcasting licenses 8 years  
Weighted-average period before the next renewal of the Company's FCC broadcasting licenses 5 years 3 months 18 days  
Advertising agency commissions of gross revenue 15.00%bbgi_AdvertisingAgencyCommission  
Barter sales revenue from Broadcasting Service $ 3.7us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue $ 4.3us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue
Barter sales expenses from Broadcasting Service 3.9us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts 4.0us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Radio stations contributed to net revenue 43.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
47.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
Quu, Inc. [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Carrying value of the investment in Quu, Inc. $ 0.9us-gaap_InvestmentOwnedAtCost
/ invest_InvestmentContractCounterpartyAxis
= bbgi_QuuIncMember
$ 0.9us-gaap_InvestmentOwnedAtCost
/ invest_InvestmentContractCounterpartyAxis
= bbgi_QuuIncMember