Equity Method Investment, Percentage of Ownership Used to Account for Investments, Maximum

No definition available.

Name:	bgc_EquityMethodInvestmentPercentageOfOwnershipUsedToAccountForInvestmentsMaximum
Namespace Prefix:	bgc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bgc_VenezuelaSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Basis of Presentation and Principles of Consolidation (Details) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Oct. 02, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Weeks in fiscal quarters	91 days
Maximum percent of ownership to exercise significant influence	2000.00%
Equity method investments	$ 9,100,000	$ 8,400,000
Venezuela Subsidiary [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity method investments			$ 0