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Market Concentrations and Risks - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Concentration Risk [Line Items] |  |  |
Number of customers | 10 bdc_NumberOfCustomers |  |
Number of Distributers | 6 bdc_NumberOfDistributers |  |
Carrying amount of debt instruments | 1,767,922,000 us-gaap_LongTermDebt | 1,367,036,000 us-gaap_LongTermDebt |
Fair value of debt instrument | 1,529,400,000 us-gaap_DebtInstrumentFairValue | 1,098,600,000 us-gaap_DebtInstrumentFairValue |
Face value of senior subordinated notes | 1,521,500,000 us-gaap_DebtInstrumentFaceAmount | 1,118,300,000 us-gaap_DebtInstrumentFaceAmount |
Copper [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Committed amounts to purchase | 1,500,000 us-gaap_RecordedUnconditionalPurchaseObligationMinimumQuantityRequired / us-gaap_ProductOrServiceAxis = bdc_CopperMember |  |
Aggregate cost | 4,600,000 us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_ProductOrServiceAxis = bdc_CopperMember |  |
Recorded unconditional purchase obligation fixed cost | 200,000 bdc_GainOrLossOnRecordedUnconditionalPurchaseObligationBasedOnMarketValue / us-gaap_ProductOrServiceAxis = bdc_CopperMember |  |
Aluminum [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Committed amounts to purchase | 700,000 us-gaap_RecordedUnconditionalPurchaseObligationMinimumQuantityRequired / us-gaap_ProductOrServiceAxis = bdc_AluminumMember |  |
Aggregate cost | 800,000 us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_ProductOrServiceAxis = bdc_AluminumMember |  |
Workforce subject to collective bargaining arrangements [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember |  |
Workforce subject to collective bargaining arrangements expiring within one year [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 19.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember |  |
Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 33.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 36.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 34.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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