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Property, Plant and Equipment - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Proceeds from disposal of real estate | $ 1,884,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | $ 3,169,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | $ 9,575,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Impairment loss recognized | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 29,800,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Depreciation expense | 43,700,000 us-gaap_Depreciation | 43,600,000 us-gaap_Depreciation | 35,100,000 us-gaap_Depreciation
Property, Plant and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment loss recognized |  |  | 10,600,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember
Customer Relationships [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment loss recognized |  |  | 6,800,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Real Estate [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment losses |  |  | 1,500,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember
Manufacturing Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment losses |  |  | 1,400,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherMachineryAndEquipmentMember
Other Property, Plant and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment losses |  |  | 1,000,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Trademarks [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment loss recognized |  |  | 5,200,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Broadcast Solutions [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Proceeds from disposal of real estate | 1,900,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 1,000,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |
Gain (loss) recognized on the sale | 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | (300,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |
Enterprise Connectivity Solutions [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Proceeds from disposal of real estate |  | 2,100,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 800,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Gain (loss) recognized on the sale |  | 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Impairment losses |  |  | 1,500,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
All Other [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Proceeds from disposal of real estate |  |  | 40,000,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Gain (loss) on the sale of assets |  | 1,300,000 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (29,800,000)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Industrial Connectivity Solutions [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Proceeds from disposal of real estate |  |  | 8,600,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Gain (loss) recognized on the sale |  |  | 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Impairment losses |  |  | $ 2,400,000 us-gaap_TangibleAssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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