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

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- Definition

Percentage of outstanding accounts receivable net.

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- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

-Section 02

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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