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Operating Segments and Geographic Information - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Number of global business platforms |  | 4 us-gaap_NumberOfReportableSegments |
Anixter International Inc. [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues generated from sales | $ 290,500,000 us-gaap_Revenues / us-gaap_MajorCustomersAxis = bdc_AnixterInternationalIncMember | $ 289,900,000 us-gaap_Revenues / us-gaap_MajorCustomersAxis = bdc_AnixterInternationalIncMember | $ 300,400,000 us-gaap_Revenues / us-gaap_MajorCustomersAxis = bdc_AnixterInternationalIncMember
Percent of revenues | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = bdc_AnixterInternationalIncMember | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = bdc_AnixterInternationalIncMember | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = bdc_AnixterInternationalIncMember
Accounts receivable outstanding | $ 37,900,000 us-gaap_AccountsReceivableNet / us-gaap_MajorCustomersAxis = bdc_AnixterInternationalIncMember |  |
Total accounts receivable outstanding | 10.00%bdc_PercentageOfOutstandingAccountsReceivableNet / us-gaap_MajorCustomersAxis = bdc_AnixterInternationalIncMember |  |

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