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Severance, Restructuring and Acquisition Integration Activities - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 Program | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost | $ 22,000,000 us-gaap_RestructuringCharges | $ 9,200,000 us-gaap_RestructuringCharges | $ 38,200,000 us-gaap_RestructuringCharges | $ 1,400,000 us-gaap_RestructuringCharges | $ 5,400,000 us-gaap_RestructuringCharges | $ 5,900,000 us-gaap_RestructuringCharges | $ 7,700,000 us-gaap_RestructuringCharges | $ 800,000 us-gaap_RestructuringCharges | $ 70,827,000 us-gaap_RestructuringCharges | $ 14,900,000 us-gaap_RestructuringCharges |
Number of significant programs |  |  |  |  |  |  |  |  | 2 bdc_NumberOfRestructuringPrograms |  |
Additional severance and other restructuring costs and accelerated depreciation expense | 21,000,000 us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1 |  |  |  |  |  |  |  | 21,000,000 us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1 |  |
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  | 20,700,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 7,100,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 6,500,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  | 46,500,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 6,500,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 10,000,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Research and Development [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  | 3,600,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 1,300,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 1,400,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Contract Termination Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  |  |  | 5,200,000 us-gaap_RestructuringCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_ContractTerminationMember
Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  | 48,557,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |  | 4,900,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Industrial IT Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  |  | 1,700,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 500,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Broadcast Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  |  | 12,100,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSegmentMember |
Enterprise Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  | 3,318,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember |  | 3,200,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Industrial Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring cost |  |  |  |  |  |  |  |  | $ 11,953,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |  | $ 9,200,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember

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