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v2.4.1.9

Intangible Assets - Changes in Carrying Amount of Trademarks (Detail) (Trademarks [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Indefinite-lived Intangible Assets [Line Items] |  |
Trademarks, Beginning Balance | $ 92,010 us-gaap_IndefiniteLivedTrademarks | $ 103,347 us-gaap_IndefiniteLivedTrademarks
Reclassify to definite-lived | (6,600)bdc_ReclassificationFromIndefiniteLivedIntangibleAssetsToDefiniteLivedAssetsTrademarks | (6,777)bdc_ReclassificationFromIndefiniteLivedIntangibleAssetsToDefiniteLivedAssetsTrademarks
Acquisitions and purchase accounting adjustments | 22,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired | (4,918)us-gaap_IndefinitelivedIntangibleAssetsAcquired
Translation impact | (4,370)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments | 358 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
Trademarks, Ending Balance | 103,040 us-gaap_IndefiniteLivedTrademarks | 92,010 us-gaap_IndefiniteLivedTrademarks
Broadcast Solutions [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Trademarks, Beginning Balance | 70,127 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 80,310 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Reclassify to definite-lived | (2,700)bdc_ReclassificationFromIndefiniteLivedIntangibleAssetsToDefiniteLivedAssetsTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | (5,424)bdc_ReclassificationFromIndefiniteLivedIntangibleAssetsToDefiniteLivedAssetsTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Acquisitions and purchase accounting adjustments | 22,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | (4,918)us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Translation impact | (2,244)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 159 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Trademarks, Ending Balance | 87,183 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 70,127 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Enterprise Connectivity Solutions [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Trademarks, Beginning Balance |  | 1,299 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Reclassify to definite-lived |  | (1,353)bdc_ReclassificationFromIndefiniteLivedIntangibleAssetsToDefiniteLivedAssetsTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Translation impact |  | 54 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Industrial Connectivity Solutions [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Trademarks, Beginning Balance | 12,193 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 12,279 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Translation impact | (1,449)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | (86)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Trademarks, Ending Balance | 10,744 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 12,193 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Industrial IT Solutions [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Trademarks, Beginning Balance | 9,690 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 9,459 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Reclassify to definite-lived | (3,900)bdc_ReclassificationFromIndefiniteLivedIntangibleAssetsToDefiniteLivedAssetsTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember |
Translation impact | (677)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 231 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Trademarks, Ending Balance | $ 5,113 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | $ 9,690 us-gaap_IndefiniteLivedTrademarks / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember

X
- Definition Reclassification From Indefinite Lived Intangible Assets To Definite Lived Assets Trademarks + References No definition available. + Details
Name: | bdc_ReclassificationFromIndefiniteLivedIntangibleAssetsToDefiniteLivedAssetsTrademarks
Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination. + References No definition available. + Details
Name: | us-gaap_IndefinitelivedIntangibleAssetsAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit, from foreign currency translation and purchase accounting adjustments. + References No definition available. + Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_IndefiniteLivedTrademarks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant