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Redeemable Noncontrolling Interest (Narrative) (Details) (ProCables S.A. [Member], Latin America [Member])
0 Months Ended
Oct. 01, 2012
Redeemable Noncontrolling Interest [Line Items]  
Percentage of interests acquired 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Term after no-transfer period that shareholders' may exercise 36 months
Percentage of voting interests to be purchased 40.00%bgc_BusinessAcquisitionPercentageofVotingIntereststobePurchased
Seller [Member]
 
Redeemable Noncontrolling Interest [Line Items]  
Noncontrolling interest, ownership percentage 40.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= bgc_ProcablesSAMember
/ invest_InvestmentGeographicRegionAxis
= us-gaap_LatinAmericaMember
/ dei_LegalEntityAxis
= bgc_SellerMember
Ownership percentage by parent 40.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= bgc_ProcablesSAMember
/ invest_InvestmentGeographicRegionAxis
= us-gaap_LatinAmericaMember
/ dei_LegalEntityAxis
= bgc_SellerMember