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Long-Term Debt (Schedule of Revolving Credit Facility) (Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended
Sep. 06, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 22, 2011
Debt Instrument [Line Items]          
Equity interest pledged in all domestic subsidiaries, percentage 100.00%bgc_EquityInterestPledgedInAllDomesticSubsidiariesPercentage        
Non-voting equity interest pledged in certain foreign subsidiaries, percentage 100.00%bgc_NonVotingEquityInterestPledgedInCertainForeignSubsidiariesPercentage        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Borrowing capacity under credit facility $ 1,000,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  $ 700,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  $ 400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Capital expenditures to fixed charges ratio 100.00%bgc_CapitalExpendituresToFixedChargesRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
129.00%bgc_CapitalExpendituresToFixedChargesRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
115.00%bgc_CapitalExpendituresToFixedChargesRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Additional borrowings 250,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Deferred financing costs capitalized     4,900,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
2,300,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Threshold for line of credit facility percentage of asset based revolving credit facilities 10.00%bgc_ThresholdForLineOfCreditFacilityPercentageOfAssetBasedRevolvingCreditFacililties
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Equity interest pledged in foreign subsidiaries, percentage 65.00%bgc_EquityInterestPledged
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
UNITED STATES [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Borrowing capacity under credit facility         630,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Undrawn availability   257,700,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
102,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
   
Europe [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Borrowing capacity under credit facility         300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_EuropeMember
Undrawn availability   113,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_EuropeMember
143,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_EuropeMember
   
CANADA [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Borrowing capacity under credit facility         70,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Undrawn availability   54,300,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
53,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
   
Minimum [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Undrawn availability     100,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Threshold for line of credit facility borrowings $ 100,000,000bgc_ThresholdForLineOfCreditBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Line of credit facility commitment fee, percentage 0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Maximum [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility commitment fee, percentage 0.375%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember