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Discontinued Operations - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Mar. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain/(Loss) on disposal of discontinued operations, net of tax | $ (562,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | $ (562,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | $ 134,480,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |
Income tax expense for discontinued operations |  | (900,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 1,400,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 78,700,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |  |
Receivable, net |  | 379,777,000 us-gaap_ReceivablesNetCurrent | 304,204,000 us-gaap_ReceivablesNetCurrent |  |  |
Partial settlement received from escrow |  | 4,200,000 us-gaap_DiscontinuedOperationAmountOfContinuingCashFlowsAfterDisposal |  |  |  |
Income/(Loss) from Discontinued Operations, before tax |  |  |  | 25,459,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax |  |
Thermax and Raydex [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Amount received in cash from the sales of business units |  |  |  | 265,600,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember |  |
Gain/(Loss) on disposal of discontinued operations, before tax |  | (900,000)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember |  | 211,600,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember |  |
Gain/(Loss) on disposal of discontinued operations, net of tax |  | (600,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember |  | 124,700,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember |  |
Income tax expense for discontinued operations |  |  | (1,400,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember |  |  |
Income/(Loss) from Discontinued Operations, before tax |  |  |  | 21,479,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_ThermaxAndRaydexMember |  |
Trapeze [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Amount received in cash from the sales of business units |  |  |  |  | 136,900,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_TrapezeNetworksIncMember |
Gain/(Loss) on disposal of discontinued operations, before tax |  |  |  |  | 88,300,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_TrapezeNetworksIncMember |
Gain/(Loss) on disposal of discontinued operations, net of tax |  | 600,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_TrapezeNetworksIncMember |  |  | 44,800,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_TrapezeNetworksIncMember |
Sale price for business |  |  |  |  | 152,100,000 bdc_SalesPriceAsPerAgreementToDivestCompanyHoldingsInDisposalGroup / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_TrapezeNetworksIncMember |
Amount in escrow as partial security for Company's indemnity obligations under transaction's purchase and sale agreement |  |  |  |  | 15,200,000 bdc_ProceedsFromDivestitureOfBusinessPlacedIntoEscrowToBeReceivedAfterClosing / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_TrapezeNetworksIncMember |
Receivable, net |  | 3,800,000 us-gaap_ReceivablesNetCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_TrapezeNetworksIncMember |  |  |  |
Communications cable operation in Phoenix, Arizona [Member] | Uncertain tax positions liability [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain/(Loss) on disposal of discontinued operations, net of tax |  |  |  |  |  | 14,100,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_CommunicationsCableOperationInPhoenixArizonaMember / us-gaap_TaxCreditCarryforwardAxis = bdc_UncertainTaxPositionsMember
Communications cable operation in Phoenix, Arizona [Member] | Uncertain tax positions liability [Member] | Reversal of accrued interest and penalties [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Income/(Loss) from Discontinued Operations, before tax |  |  |  |  |  | 4,000,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_CommunicationsCableOperationInPhoenixArizonaMember / us-gaap_IncomeStatementLocationAxis = bdc_InterestAndPenaltiesMember / us-gaap_TaxCreditCarryforwardAxis = bdc_UncertainTaxPositionsMember
Income/(Loss) from Discontinued Operations, net of tax |  |  |  |  |  | $ 2,600,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = bdc_CommunicationsCableOperationInPhoenixArizonaMember / us-gaap_IncomeStatementLocationAxis = bdc_InterestAndPenaltiesMember / us-gaap_TaxCreditCarryforwardAxis = bdc_UncertainTaxPositionsMember

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- Definition Amount of cash flows that are expected to continue with the disposal group that is a component of the entity (discontinued operation) after it has been sold or otherwise disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Continuation of Activities -URI http://asc.fasb.org/extlink&oid=6508610 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Continuing Cash Flows -URI http://asc.fasb.org/extlink&oid=6508624 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1482-107760 + Details
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- Definition Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -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 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph 15 -Article 3 + Details
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