XML 59 R46.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Acquisitions and Dispositions - Schedule of Assumptions Used in Valuation of FCC Broadcasting Licenses (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2018
CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member] |
Fair Value Inputs Asset Quantitative Information [Line Items] |
Market revenue shares at maturity | 5.30%
Operating income margins at maturity | 36.00%
CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member] | Measurement Input, Discount Rate [Member] |
Fair Value Inputs Asset Quantitative Information [Line Items] |
Fair value assumptions inputs rate | 9.00%
WXTU-FM [Member] |
Fair Value Inputs Asset Quantitative Information [Line Items] |
Market revenue shares at maturity | 5.40%
Operating income margins at maturity | 30.50%
WXTU-FM [Member] | Measurement Input, Discount Rate [Member] |
Fair Value Inputs Asset Quantitative Information [Line Items] |
Fair value assumptions inputs rate | 9.00%
Minimum [Member] | CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] |
Fair Value Inputs Asset Quantitative Information [Line Items] |
Fair value assumptions inputs rate | (0.50%)
Minimum [Member] | WXTU-FM [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] |
Fair Value Inputs Asset Quantitative Information [Line Items] |
Fair value assumptions inputs rate | 0.60%
Maximum [Member] | CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] |
Fair Value Inputs Asset Quantitative Information [Line Items] |
Fair value assumptions inputs rate | 2.40%
Maximum [Member] | WXTU-FM [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] |
Fair Value Inputs Asset Quantitative Information [Line Items] |
Fair value assumptions inputs rate | 1.30%

X
- Definition Fair Value Assumptions Inputs Long Term Pre Tax Operating Margin Percent + References No definition available. + Details
Name: | bbgi_FairValueAssumptionsInputsLongTermsPreTaxOperatingMarginPercent
Namespace Prefix: | bbgi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair Value Assumptions Inputs Rate. + References No definition available. + Details
Name: | bbgi_FairValueAssumptionsInputsRate
Namespace Prefix: | bbgi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair Value Inputs Asset Quantitative Information [Line Items] + References No definition available. + Details
Name: | bbgi_FairValueInputsAssetQuantitativeInformationLineItems
Namespace Prefix: | bbgi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Market revenue shares at maturity. + References No definition available. + Details
Name: | bbgi_MarketRevenueSharesAtMaturity
Namespace Prefix: | bbgi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bbgi_CbsRadioStationsIncEntercomBostonLlcAndTheEntercomDivestitureTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bbgi_WxtufmMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputLongTermRevenueGrowthRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |