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Accounts Payable and Accrued Liabilities - Carrying Value of Accounts Payable and Accrued Liabilities (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2015
Payables and Accruals [Abstract] |
Individual item in other accrued liabilities | Less than 5% of total current liabilities

X
- Definition Individual item in other accrued liabilities. + References No definition available. + Details
Name: | bdc_IndividualItemInOtherAccruedLiabilities
Namespace Prefix: | bdc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration