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v2.4.1.9

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, 2014 | Dec. 31, 2013
Revolving Credit Agreement Mature 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Revolving credit agreement, maturity | 2018 |
Variable Term loan Due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, maturity | 2020 | 2020
5.25% Senior Subordinated Notes Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Senior subordinated notes maturity year | 2024 | 2024
Senior subordinated notes interest rate | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember
5.50% Senior subordinated notes due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Senior subordinated notes maturity year | 2023 | 2023
Senior subordinated notes interest rate | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember
5.50% Senior subordinated notes due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Senior subordinated notes maturity year | 2022 | 2022
Senior subordinated notes interest rate | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember
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%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember | 9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember

X
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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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