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