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Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 773,048 us-gaap_Goodwill | $ 778,708 us-gaap_Goodwill
Acquisitions and purchase accounting adjustments | 192,554 bdc_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount | 4,986 bdc_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount
Translation impact | (22,228)us-gaap_GoodwillTranslationAdjustments | (10,646)us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance | 943,374 us-gaap_Goodwill | 773,048 us-gaap_Goodwill
Americas [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance |  | 690,578 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember
Reassignment of goodwill |  | (690,578)us-gaap_GoodwillTransfers / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AmericasMember
EMEA [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance |  | 70,328 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember
Reassignment of goodwill |  | (70,328)us-gaap_GoodwillTransfers / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EMEAMember
Asia Pacific [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance |  | 17,802 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember
Reassignment of goodwill |  | (17,802)us-gaap_GoodwillTransfers / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember
Broadcast Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 466,375 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |
Reassignment of goodwill |  | 473,029 us-gaap_GoodwillTransfers / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Acquisitions and purchase accounting adjustments | 119,918 bdc_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 4,986 bdc_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Translation impact | (12,789)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | (11,640)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Goodwill, Ending Balance | 573,504 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 466,375 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Enterprise Connectivity Solutions [Member] |  |
Goodwill [Line Items] |  |
Reassignment of goodwill |  | 50,136 us-gaap_GoodwillTransfers / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Goodwill, Ending Balance | 50,136 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 50,136 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Industrial Connectivity Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 187,975 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |
Reassignment of goodwill |  | 188,201 us-gaap_GoodwillTransfers / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Acquisitions and purchase accounting adjustments | 16,442 bdc_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |
Translation impact | (4,364)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | (226)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Goodwill, Ending Balance | 200,053 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 187,975 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Industrial IT Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 68,562 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember |
Reassignment of goodwill |  | 67,342 us-gaap_GoodwillTransfers / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Acquisitions and purchase accounting adjustments | 56,194 bdc_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember |
Translation impact | (5,075)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 1,220 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Goodwill, Ending Balance | $ 119,681 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | $ 68,562 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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