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Severance, Restructuring and Acquisition Integration Activities - Severance, Restructuring and Integration Costs by Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Costs | $ 22,000 us-gaap_RestructuringCharges | $ 9,200 us-gaap_RestructuringCharges | $ 38,200 us-gaap_RestructuringCharges | $ 1,400 us-gaap_RestructuringCharges | $ 5,400 us-gaap_RestructuringCharges | $ 5,900 us-gaap_RestructuringCharges | $ 7,700 us-gaap_RestructuringCharges | $ 800 us-gaap_RestructuringCharges | $ 70,827 us-gaap_RestructuringCharges | $ 14,900 us-gaap_RestructuringCharges |
Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Costs |  |  |  |  |  |  |  |  | 48,557 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |  | 4,900 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Enterprise Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Costs |  |  |  |  |  |  |  |  | 3,318 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember |  | 3,200 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Industrial Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Costs |  |  |  |  |  |  |  |  | 11,953 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |  | 9,200 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Industrial IT Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Costs |  |  |  |  |  |  |  |  | 6,999 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialItMember |  |
Employee Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance |  |  |  |  |  |  |  |  | 37,254 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |
Employee Severance [Member] | Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance |  |  |  |  |  |  |  |  | 20,025 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |  |
Employee Severance [Member] | Enterprise Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance |  |  |  |  |  |  |  |  | 2,183 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember |  |
Employee Severance [Member] | Industrial Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance |  |  |  |  |  |  |  |  | 9,732 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |  |
Employee Severance [Member] | Industrial IT Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance |  |  |  |  |  |  |  |  | 5,314 us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialItMember |  |
Other Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  | 33,573 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  |
Other Restructuring [Member] | Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  | 28,532 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |  |
Other Restructuring [Member] | Enterprise Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  | 1,135 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember |  |
Other Restructuring [Member] | Industrial Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  | 2,221 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |  |
Other Restructuring [Member] | Industrial IT Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  | $ 1,685 us-gaap_OtherRestructuringCosts / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialItMember |  |

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- Definition Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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