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Income Taxes - Summary of Net Operating Loss Carryforwards (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | $ 652,087 us-gaap_OperatingLossCarryforwards
France [Member] |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 272,351 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_FR
United States [Member] |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 188,178 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_US
Netherlands [Member] |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 73,828 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_NL
Germany [Member] |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 59,761 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_DE
Japan [Member] |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 27,410 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_JP
Australia [Member] |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | 15,901 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_AU
All Other [Member] |
Operating Loss Carryforwards [Line Items] |
Net operating loss carryforwards | $ 14,658 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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