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Defined Contribution Plan (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2012 Age | Dec. 31, 2011 Age
Defined Contribution Plan (Textual) [Abstract] |  |
Employee Minimum Contribution for compensation | 1.00% |
Maximum Limited contributions with catchup | $ 22,500 | $ 22,000
Maximum Limited contributions | 17,000 | 16,500
Employer matching contributions | $ 0 | $ 0
Age requirement under plan | 50 | 50

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- Definition Age requirement for catchup contributions. + References No definition available. + Details
Name: | bbgi_CatchupContributionsAgeRequirement
Namespace Prefix: | bbgi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined contribution plan maximum annual contribution with catchup per employee amount. + References No definition available. + Details
Name: | bbgi_DefinedContributionPlanMaximumAnnualContributionWithCatchupPerEmployeeAmount
Namespace Prefix: | bbgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Minimum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | bbgi_DefinedContributionPlanMinimumAnnualContributionPerEmployeePercent
Namespace Prefix: | bbgi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | bbgi_DefinedContributionPlanTextualAbstract
Namespace Prefix: | bbgi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum amount per employee, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration