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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 11, 2014 | Mar. 31, 2014 | Dec. 10, 2012 | Jul. 27, 2012
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 943,374 us-gaap_Goodwill | $ 773,048 us-gaap_Goodwill | $ 778,708 us-gaap_Goodwill |  |  |  |
Prosoft Technology, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  | 2,517 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Receivables |  |  |  | 5,559 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Inventories |  |  |  | 3,624 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Other current assets |  |  |  | 240 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Property, plant and equipment |  |  |  | 1,076 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Goodwill |  |  |  | 56,193 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Intangible assets |  |  |  | 40,800 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Other non-current assets |  |  |  | 622 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Total assets |  |  |  | 110,631 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Accounts payable |  |  |  | 2,851 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Accrued liabilities |  |  |  | 2,545 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Other long-term / non-current liabilities |  |  |  | 1,132 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Total liabilities |  |  |  | 6,528 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Net assets |  |  |  | 104,103 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bdc_ProsoftTechnologyMember |  |  |
Grass Valley [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  |  | 9,441 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Receivables |  |  |  |  | 68,766 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Inventories |  |  |  |  | 19,984 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Deferred taxes |  |  |  |  | 1,355 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Other current assets |  |  |  |  | 4,172 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Property, plant and equipment |  |  |  |  | 22,661 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Goodwill |  |  |  |  | 119,589 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Intangible assets |  |  |  |  | 95,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Other non-current assets |  |  |  |  | 17,108 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Total assets |  |  |  |  | 358,576 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Accounts payable |  |  |  |  | 51,276 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Accrued liabilities |  |  |  |  | 57,374 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Deferred revenue |  |  |  |  | 14,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Postretirement benefits |  |  |  |  | 16,538 bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDefinedBenefitPostretirementPlanObligations / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Other long-term / non-current liabilities |  |  |  |  | 1,199 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Total liabilities |  |  |  |  | 140,387 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
Net assets |  |  |  |  | 218,189 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bdc_GrassValleyMember |  |
PPC Broadband, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  |  |  | 6,874 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Receivables |  |  |  |  |  | 26,612 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Inventories |  |  |  |  |  | 45,465 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Other current assets |  |  |  |  |  | 868 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Property, plant and equipment |  |  |  |  |  | 26,856 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Goodwill |  |  |  |  |  | 277,091 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Intangible assets |  |  |  |  |  | 164,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Other non-current assets |  |  |  |  |  | 1,308 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Total assets |  |  |  |  |  | 549,574 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Accounts payable |  |  |  |  |  | 22,499 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Accrued liabilities |  |  |  |  |  | 4,104 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Other long-term / non-current liabilities |  |  |  |  |  | 579 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Total liabilities |  |  |  |  |  | 27,182 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Net assets |  |  |  |  |  | 522,392 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bdc_PpcBroadbandIncMember |
Miranda Technologies Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | 33,324 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Receivables |  |  |  |  |  |  | 27,592 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Inventories |  |  |  |  |  |  | 31,109 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Other current assets |  |  |  |  |  |  | 1,924 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Property, plant and equipment |  |  |  |  |  |  | 23,930 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Goodwill |  |  |  |  |  |  | 161,206 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Intangible assets |  |  |  |  |  |  | 159,991 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Total assets |  |  |  |  |  |  | 439,076 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Accounts payable |  |  |  |  |  |  | 23,917 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Accrued liabilities |  |  |  |  |  |  | 5,730 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Current deferred tax liabilities |  |  |  |  |  |  | 844 us-gaap_DeferredTaxLiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Other long-term / non-current liabilities |  |  |  |  |  |  | 8,699 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Non-current deferred tax liabilities |  |  |  |  |  |  | 25,207 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Total liabilities |  |  |  |  |  |  | 64,397 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember
Net assets |  |  |  |  |  |  | $ 374,679 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bdc_MirandaTechnologiesIncMember

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