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Equity Method Investment - Additional Information (Detail) (USD $) | 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
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 608,910,000 us-gaap_SalesRevenueGoodsNet | $ 610,774,000 us-gaap_SalesRevenueGoodsNet | $ 600,891,000 us-gaap_SalesRevenueGoodsNet | $ 487,690,000 us-gaap_SalesRevenueGoodsNet | $ 509,751,000 us-gaap_SalesRevenueGoodsNet | $ 522,478,000 us-gaap_SalesRevenueGoodsNet | $ 529,491,000 us-gaap_SalesRevenueGoodsNet | $ 507,473,000 us-gaap_SalesRevenueGoodsNet | $ 2,308,265,000 us-gaap_SalesRevenueGoodsNet | $ 2,069,193,000 us-gaap_SalesRevenueGoodsNet | $ 1,840,739,000 us-gaap_SalesRevenueGoodsNet
Receivables | 379,777,000 us-gaap_ReceivablesNetCurrent |  |  |  | 304,204,000 us-gaap_ReceivablesNetCurrent |  |  |  | 379,777,000 us-gaap_ReceivablesNetCurrent | 304,204,000 us-gaap_ReceivablesNetCurrent |
Hirschmann JV [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember |  |  |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember |  |
Carrying value recorded in other long-lived assets | 33,400,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember |  |  |  | 38,300,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember |  |  |  | 33,400,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember | 38,300,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember |
Sales |  |  |  |  |  |  |  |  | 2,600,000 us-gaap_SalesRevenueGoodsNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember | 3,600,000 us-gaap_SalesRevenueGoodsNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember | 5,700,000 us-gaap_SalesRevenueGoodsNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember
Dividend received from the Hirschmann JV |  |  |  |  |  |  |  |  | 5,700,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember | 8,100,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember | 12,500,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember
Receivables | $ 500,000 us-gaap_ReceivablesNetCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember |  |  |  | $ 300,000 us-gaap_ReceivablesNetCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember |  |  |  | $ 500,000 us-gaap_ReceivablesNetCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember | $ 300,000 us-gaap_ReceivablesNetCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdc_HirschmannJvMember |

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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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