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Operating Segments and Geographic Information - Operating Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External customer revenues | $ 608,910 us-gaap_SalesRevenueGoodsNet | $ 610,774 us-gaap_SalesRevenueGoodsNet | $ 600,891 us-gaap_SalesRevenueGoodsNet | $ 487,690 us-gaap_SalesRevenueGoodsNet | $ 509,751 us-gaap_SalesRevenueGoodsNet | $ 522,478 us-gaap_SalesRevenueGoodsNet | $ 529,491 us-gaap_SalesRevenueGoodsNet | $ 507,473 us-gaap_SalesRevenueGoodsNet | $ 2,308,265 us-gaap_SalesRevenueGoodsNet | $ 2,069,193 us-gaap_SalesRevenueGoodsNet | $ 1,840,739 us-gaap_SalesRevenueGoodsNet
Depreciation and amortization |  |  |  |  |  |  |  |  | (102,162)us-gaap_DepreciationDepletionAndAmortization | (94,451)us-gaap_DepreciationDepletionAndAmortization | (59,355)us-gaap_DepreciationDepletionAndAmortization
Operating income | 43,271 us-gaap_OperatingIncomeLoss | 58,011 us-gaap_OperatingIncomeLoss | 12,326 us-gaap_OperatingIncomeLoss | 49,511 us-gaap_OperatingIncomeLoss | 49,174 us-gaap_OperatingIncomeLoss | 53,935 us-gaap_OperatingIncomeLoss | 53,913 us-gaap_OperatingIncomeLoss | 44,240 us-gaap_OperatingIncomeLoss | 163,119 us-gaap_OperatingIncomeLoss | 201,262 us-gaap_OperatingIncomeLoss | 108,497 us-gaap_OperatingIncomeLoss
Total assets | 3,262,827 us-gaap_Assets |  |  |  | 2,751,753 us-gaap_Assets |  |  |  | 3,262,827 us-gaap_Assets | 2,751,753 us-gaap_Assets | 2,584,583 us-gaap_Assets
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 45,459 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 40,209 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 41,010 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External customer revenues |  |  |  |  |  |  |  |  | 2,308,265 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 2,069,193 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,840,739 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Affiliate revenues |  |  |  |  |  |  |  |  | 12,829 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 12,865 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 8,573 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Total revenues |  |  |  |  |  |  |  |  | 2,321,094 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 2,082,058 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,849,312 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Depreciation and amortization |  |  |  |  |  |  |  |  | (102,162)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (94,451)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (57,887)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Asset impairment and loss on sale of assets |  |  |  |  |  |  |  |  |  |  | (33,676)us-gaap_OtherAssetImpairmentCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating income |  |  |  |  |  |  |  |  | 163,046 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 196,132 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 100,932 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Total assets | 960,782 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  |  |  | 833,585 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  |  |  | 960,782 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 833,585 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 825,123 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 42,442 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 38,791 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 39,879 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Reportable Segment [Member] | Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External customer revenues |  |  |  |  |  |  |  |  | 916,632 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 663,900 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 356,320 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Affiliate revenues |  |  |  |  |  |  |  |  | 1,381 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 933 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 691 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Total revenues |  |  |  |  |  |  |  |  | 918,013 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 664,833 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 357,011 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Depreciation and amortization |  |  |  |  |  |  |  |  | (67,372)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | (64,420)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | (23,184)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Operating income |  |  |  |  |  |  |  |  | 4,093 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 15,099 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | (11,657)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Total assets | 430,991 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |  |  |  | 294,454 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember |  |  |  | 430,991 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 294,454 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 272,520 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 17,912 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 10,526 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember | 8,844 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_BroadcastSolutionsMember
Reportable Segment [Member] | Enterprise Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External customer revenues |  |  |  |  |  |  |  |  | 455,795 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 493,129 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 496,857 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Affiliate revenues |  |  |  |  |  |  |  |  | 8,467 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 9,823 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 6,467 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Total revenues |  |  |  |  |  |  |  |  | 464,262 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 502,952 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 503,324 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Depreciation and amortization |  |  |  |  |  |  |  |  | (14,331)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | (12,988)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | (16,057)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Asset impairment and loss on sale of assets |  |  |  |  |  |  |  |  |  |  | (1,468)us-gaap_OtherAssetImpairmentCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Operating income |  |  |  |  |  |  |  |  | 47,715 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 48,753 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 40,056 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Total assets | 206,377 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember |  |  |  | 223,073 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember |  |  |  | 206,377 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 223,073 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 234,882 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 12,574 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 11,749 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember | 13,013 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_EnterpriseConnectivitySolutionsMember
Reportable Segment [Member] | Industrial Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External customer revenues |  |  |  |  |  |  |  |  | 682,374 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 680,643 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 670,112 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Affiliate revenues |  |  |  |  |  |  |  |  | 2,927 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 1,901 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 1,129 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Total revenues |  |  |  |  |  |  |  |  | 685,301 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 682,544 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 671,241 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Depreciation and amortization |  |  |  |  |  |  |  |  | (12,318)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | (11,408)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | (10,970)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Asset impairment and loss on sale of assets |  |  |  |  |  |  |  |  |  |  | (2,435)us-gaap_OtherAssetImpairmentCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Operating income |  |  |  |  |  |  |  |  | 80,435 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 92,562 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 72,366 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Total assets | 255,997 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |  |  |  | 259,400 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember |  |  |  | 255,997 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 259,400 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 263,293 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 10,053 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 14,496 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember | 13,077 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialConnectivitySolutionsMember
Reportable Segment [Member] | Industrial IT Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External customer revenues |  |  |  |  |  |  |  |  | 253,464 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 231,521 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 219,679 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Affiliate revenues |  |  |  |  |  |  |  |  | 54 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 208 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 286 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Total revenues |  |  |  |  |  |  |  |  | 253,518 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 231,729 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 219,965 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Depreciation and amortization |  |  |  |  |  |  |  |  | (8,141)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | (5,635)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | (4,848)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Operating income |  |  |  |  |  |  |  |  | 30,803 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 38,440 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 32,807 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Total assets | 67,417 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember |  |  |  | 56,658 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember |  |  |  | 67,417 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 56,658 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 54,428 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 1,903 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 2,020 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember | 4,597 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = bdc_IndustrialInformationTechnologySolutionsMember
All Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External customer revenues |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | 97,771 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Affiliate revenues |  |  |  |  |  |  |  |  | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Total revenues |  |  |  |  |  |  |  |  | 0 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | 97,771 bdc_ExternalAndIntercompanyRevenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | (2,828)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Asset impairment and loss on sale of assets |  |  |  |  |  |  |  |  | 0 us-gaap_OtherAssetImpairmentCharges / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | (29,773)us-gaap_OtherAssetImpairmentCharges / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Operating income |  |  |  |  |  |  |  |  | 0 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 1,278 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (32,640)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Total assets | 0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |  |  |  |  |  |  | 0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | $ 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | $ 348 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember

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