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v2.4.1.9

Accounts Payable and Accrued Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Statement of Financial Position [Abstract] |  |
Accounts payable due to bank | $ 14.7 bdc_AccountsPayableDueToBankCurrent | $ 16.1 bdc_AccountsPayableDueToBankCurrent
Settlement of accounts payable outstanding | 1 year |

X
- Definition Accounts payable due to bank current. + References No definition available. + Details
Name: | bdc_AccountsPayableDueToBankCurrent
Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term of settlement of accounts payable due to bank. + References No definition available. + Details
Name: | bdc_TermOfSettlementOfAccountsPayableDueToBank
Namespace Prefix: | bdc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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