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Contingent Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Standby letters of credit [Member] |
Line of Credit Facility [Line Items] |
Loss contingency, range of possible loss, portion not accrued | $ 8.3 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember
Bank guarantees [Member] |
Line of Credit Facility [Line Items] |
Loss contingency, range of possible loss, portion not accrued | 1.7 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = bdc_BankGuaranteesMember
Surety bonds [Member] |
Line of Credit Facility [Line Items] |
Loss contingency, range of possible loss, portion not accrued | $ 1.8 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_SuretyBondMember

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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