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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
Income tax expense (benefit) for discontinued operations $ (900,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 1,400,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 78,700,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Statutory tax rates 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income tax expense tax holiday 2,000,000us-gaap_IncomeTaxHolidayAggregateDollarAmount    
Income tax holiday expire 2022    
Income from continuing operations before taxes 81,546,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 127,049,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 5,042,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense (benefit) 7,114,000us-gaap_IncomeTaxExpenseBenefit 22,315,000us-gaap_IncomeTaxExpenseBenefit (38,194,000)us-gaap_IncomeTaxExpenseBenefit
Tax benefit 24,910,000us-gaap_CurrentIncomeTaxExpenseBenefit 16,858,000us-gaap_CurrentIncomeTaxExpenseBenefit 4,556,000us-gaap_CurrentIncomeTaxExpenseBenefit
Income tax benefit due to reduction in valuation allowances     9,500,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Net operating loss carryforwards 652,087,000us-gaap_OperatingLossCarryforwards    
Net tax credit carryforwards 57,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards    
Operating loss carryforwards that will be used in expiration periods 137,400,000bdc_OperatingLossCarryForwardUsageWithinExpiration    
Net tax credit carryforwards that will expire 54,500,000bdc_NetTaxCreditCarryforwardsThatWillExpire    
Net tax credit carry forwards with indefinite carry forward period 2,500,000bdc_NetTaxCreditCarryForwardsWithIndefiniteCarryForwardPeriod    
Provision for U.S or additional foreign withholding taxes 582,600,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Net change in reserve for uncertain tax positions (8,600,000)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease    
Balance at end of the year of unrecognized tax benefits 10,057,000us-gaap_UnrecognizedTaxBenefits 18,639,000us-gaap_UnrecognizedTaxBenefits 17,377,000us-gaap_UnrecognizedTaxBenefits
Estimate the range of reasonably possible changes to unrecognized tax positions 3,800,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound    
Recognized interest expense (income) and penalties of unrecognized tax benefits (1,100,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 1,700,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Accrued interest expense (income) and penalties of unrecognized tax benefits 1,700,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 2,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
2018 and 2020 [Member]      
Income Taxes [Line Items]      
Net tax credit carryforwards that will expire 27,400,000bdc_NetTaxCreditCarryforwardsThatWillExpire
/ us-gaap_RangeAxis
= bdc_RangeOneMember		    
Expiration period of net tax credit carryforwards 2018 and 2020    
2023 and 2024 [Member]      
Income Taxes [Line Items]      
Net tax credit carryforwards that will expire 3,400,000bdc_NetTaxCreditCarryforwardsThatWillExpire
/ us-gaap_RangeAxis
= bdc_RangeTwoMember		    
Expiration period of net tax credit carryforwards 2023 and 2024    
2027 and 2034 [Member]      
Income Taxes [Line Items]      
Net tax credit carryforwards that will expire 23,700,000bdc_NetTaxCreditCarryforwardsThatWillExpire
/ us-gaap_RangeAxis
= bdc_RangeThreeMember		    
Expiration period of net tax credit carryforwards 2027 and 2034    
Net Operating Loss Carry Forwards Expires In 2014 [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards 22,500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= bdc_NetOperatingLossCarryForwardsExpiresInTwoThousandFourteenMember		    
Net Operating Loss Carry Forwards Expires In 2015 [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards 30,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= bdc_NetOperatingLossCarryForwardsExpiresInTwoThousandFifteenMember		    
Net Operating Loss Carry Forwards Expires In 2016 [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards 13,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= bdc_NetOperatingLossCarryForwardsExpiresInTwoThousandSixteenMember		    
Net Operating Loss Carry Forwards Expires Between 2017 and 2019 [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards 37,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= bdc_NetOperatingLossCarryForwardsExpiresBetweenTwoThousandSeventeenAndTwoThousandNineteenMember		    
Net Operating Loss Carry Forwards Expires Between 2020 and 2034 [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards 188,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= bdc_NetOperatingLossCarryForwardsExpiresBetweenTwoThousandTwentyAndTwoThousandThirtyFourMember		    
Net Operating Loss Carry Forward Indefinite Period [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards 360,800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= bdc_NetOperatingLossCarryForwardIndefinitePeriodMember		    
Grass Valley [Member]      
Income Taxes [Line Items]      
Acquisition of deferred tax assets 143,500,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= bdc_GrassValleyMember		    
Valuation Allowance 143,500,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_BusinessAcquisitionAxis
= bdc_GrassValleyMember		    
Valuation allowances for net operating losses 4,300,000us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_BusinessAcquisitionAxis
= bdc_GrassValleyMember		    
Germany [Member]      
Income Taxes [Line Items]      
Statutory tax rates 28.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_DE		    
Net operating loss carryforwards 59,761,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_DE		    
Canada [Member]      
Income Taxes [Line Items]      
Statutory tax rates 26.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_CA		    
Netherlands [Member]      
Income Taxes [Line Items]      
Statutory tax rates 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_NL		    
Net operating loss carryforwards 73,828,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_NL		    
Cooper Industries [Member]      
Income Taxes [Line Items]      
Final settlement amount   30,000,000us-gaap_LitigationSettlementAmount
/ dei_LegalEntityAxis
= bdc_CooperIndustriesMember		  
Tax benefit     $ 21,000,000us-gaap_CurrentIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= bdc_CooperIndustriesMember