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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Total Comprehensive Income (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
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 15,993 us-gaap_NetIncomeLoss | $ 33,847 us-gaap_NetIncomeLoss | $ 15 us-gaap_NetIncomeLoss | $ 24,594 us-gaap_NetIncomeLoss | $ 22,508 us-gaap_NetIncomeLoss | $ 29,068 us-gaap_NetIncomeLoss | $ 29,492 us-gaap_NetIncomeLoss | $ 22,245 us-gaap_NetIncomeLoss | $ 74,449 us-gaap_NetIncomeLoss | $ 103,313 us-gaap_NetIncomeLoss | $ 194,490 us-gaap_NetIncomeLoss
Foreign currency translation loss, net of $1.8 million, $2.2 million, and $0.0 million tax, respectively |  |  |  |  |  |  |  |  | (10,387)bdc_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodNetOfTax | (20,720)bdc_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodNetOfTax | (1,414)bdc_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodNetOfTax
Foreign currency hedging instruments, net of $0.0 million, $0.0 million, and $1.6 million tax, respectively |  |  |  |  |  |  |  |  |  |  | 2,467 bdc_OtherComprehensiveIncomeLossForeignCurrencyHedgingInstrumentAdjustmentNetOfTax
Adjustments to pension and postretirement liability, net of $3.2, $14.0 and $3.6 million tax for the years 2012, 2013 and 2014 respectively |  |  |  |  |  |  |  |  | (6,463)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 22,104 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | (8,909)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Comprehensive income |  |  |  |  |  |  |  |  | $ 57,599 us-gaap_ComprehensiveIncomeNetOfTax | $ 104,697 us-gaap_ComprehensiveIncomeNetOfTax | $ 186,634 us-gaap_ComprehensiveIncomeNetOfTax

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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References No definition available. + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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