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Long-Term Debt and Other Borrowing Arrangements - Carrying Values of Long-Term Debt and Other Borrowing Arrangements (Parenthetical) (Detail)
3 Months Ended 12 Months Ended
Mar. 29, 2015
Dec. 31, 2014
Revolving Credit Agreement Mature 2018 [Member]    
Debt Instrument [Line Items]    
Revolving credit agreement, maturity 2018 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