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Long-Term Debt and Other Borrowing Arrangements - Carrying Values of Long-Term Debt and Other Borrowing Arrangements (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Variable rate term loans due 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, maturity | 2017 | 2017
Revolving credit agreement due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, maturity | 2016 | 2016
Revolving credit agreement due 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, maturity | 2018 | 2018
Variable rate term loans due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, maturity | 2020 | 2020
5.5% Senior subordinated notes due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Senior subordinated notes maturity year | 2022 | 2022
Senior subordinated notes interest rate | 5.50% | 5.50%
5.5% Senior subordinated notes due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Senior subordinated notes maturity year | 2023 |
Senior subordinated notes interest rate | 5.50% | 5.50%
9.25% Senior subordinated notes due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Senior subordinated notes maturity year | 2019 | 2019
Senior subordinated notes interest rate | 9.25% | 9.25%

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- Definition Line Of Credit Facility Maturity Year + References No definition available. + Details
Name: | bdc_LineOfCreditFacilityMaturityYear
Namespace Prefix: | bdc_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | instant

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- Definition Secured Debt Maturity Year + References No definition available. + Details
Name: | bdc_SecuredDebtMaturityYear
Namespace Prefix: | bdc_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | instant

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- Definition Senior subordinated note maturity period. + References No definition available. + Details
Name: | bdc_SeniorSubordinatedNoteMaturityPeriod
Namespace Prefix: | bdc_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant