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Income Taxes - Components of Deferred Income Tax Balances (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred income tax liabilities: |  |
Plant, equipment and intangibles | $ (90,414)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | $ (97,229)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred income tax assets: |  |
Postretirement, pensions, and stock compensation | 34,656 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 27,592 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Reserves and accruals | 44,809 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 33,788 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Net operating loss and tax credit carryforwards | 217,902 bdc_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards | 88,307 bdc_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards
Valuation allowances | (157,317)us-gaap_DeferredTaxAssetsValuationAllowance | (10,165)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets | 140,050 us-gaap_DeferredTaxAssetsNet | 139,522 us-gaap_DeferredTaxAssetsNet
Net deferred income tax asset | $ 49,636 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 42,293 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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