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Redeemable Noncontrolling Interest (Narrative) (Details) (ProCables S.A. [Member], Latin America [Member])
Oct. 01, 2012
ProCables S.A. [Member] | Latin America [Member]
 
Redeemable Noncontrolling Interest [Line Items]  
Percentage of interests acquired 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bgc_ProcablesSAMember
/ invest_InvestmentGeographicRegionAxis
= us-gaap_LatinAmericaMember