XML 89 R77.htm IDEA: XBRL DOCUMENT v3.3.1.900

Defined Contribution Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Sale Of Subsidiary [Abstract]
Employer matching contributions	$ 0	$ 0

X

- Definition

Schedule Of Sale Of Subsidiary [Abstract]

+ References

No definition available.

+ Details

Name:	bbgi_ScheduleOfSaleOfSubsidiaryAbstract
Namespace Prefix:	bbgi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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