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Long-Term Debt and Other Borrowing Arrangements - Additional Information (Detail)
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Mar. 29, 2015
USD ($)
Mar. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Mar. 29, 2015
9.25% Senior Subordinated Notes Due 2019 [Member]
USD ($)
Dec. 31, 2014
9.25% Senior Subordinated Notes Due 2019 [Member]
USD ($)
Mar. 29, 2015
5.25% Senior Subordinated Notes Due 2024 [Member]
USD ($)
Dec. 31, 2014
5.25% Senior Subordinated Notes Due 2024 [Member]
USD ($)
Jun. 29, 2014
5.25% Senior Subordinated Notes Due 2024 [Member]
Senior Subordinate Notes [Member]
USD ($)
Mar. 29, 2015
5.25% Senior Subordinated Notes Due 2024 [Member]
Senior Subordinate Notes [Member]
Mar. 29, 2015
Revolving Credit Agreement Mature 2018 [Member]
USD ($)
Dec. 31, 2014
Revolving Credit Agreement Mature 2018 [Member]
Jan. 31, 2015
Revolving Credit Agreement Mature 2018 [Member]
USD ($)
Mar. 29, 2015
Revolving Credit Agreement Mature 2018 [Member]
Minimum [Member]
Mar. 29, 2015
Revolving Credit Agreement Mature 2018 [Member]
Maximum [Member]
Mar. 29, 2015
Variable Term loan Due 2020 [Member]
USD ($)
Dec. 31, 2014
Variable Term loan Due 2020 [Member]
Nov. 30, 2014
5.5% Senior Subordinated Notes Due 2023 [Member]
Senior Subordinate Notes [Member]
USD ($)
Nov. 30, 2014
5.5% Senior Subordinated Notes Due 2023 [Member]
Senior Subordinate Notes [Member]
EUR (€)
Mar. 31, 2013
5.5% Senior Subordinated Notes Due 2023 [Member]
Senior Subordinate Notes [Member]
USD ($)
Mar. 29, 2015
5.5% Senior Subordinated Notes Due 2023 [Member]
Senior Subordinate Notes [Member]
USD ($)
Mar. 31, 2013
5.5% Senior Subordinated Notes Due 2023 [Member]
Senior Subordinate Notes [Member]
EUR (€)
Mar. 29, 2015
5.5% Senior Subordinated Notes Due 2022 [Member]
Senior Subordinate Notes [Member]
USD ($)
Debt Instrument [Line Items]                                            
Borrowing under line of credit facility                   $ 400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= bdc_RevolvingCreditFacilityMatureTwoThousandEighteenMember
                       
Amount borrowed under revolving credit facility                   200,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= bdc_RevolvingCreditFacilityMatureTwoThousandEighteenMember
  200,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= bdc_RevolvingCreditFacilityMatureTwoThousandEighteenMember
                   
Revolving credit agreement, maturity                   2018 2018                      
Line of credit borrowing base                   114,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= bdc_RevolvingCreditFacilityMatureTwoThousandEighteenMember
                       
Description of variable rate basis                   LIBOR or other similar indices in foreign jurisdictions         Three-month LIBOR plus an applicable spread.              
Line of credit spread on variable rate                         1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= bdc_RevolvingCreditFacilityMatureTwoThousandEighteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= bdc_RevolvingCreditFacilityMatureTwoThousandEighteenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
               
Line of credit commitment fees                   0.375%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= bdc_RevolvingCreditFacilityMatureTwoThousandEighteenMember
                       
Line of credit facility description                   In the event we borrow more than 90% of our borrowing base, we are subject to a fixed charge coverage ratio covenant.                        
Revolving credit facility restrictive covenants fixed charge coverage ratio minimum threshold                   90.00%bdc_SeniorSecuredCreditFacilityRestrictiveCovenantsFixedChargeCoverageRatioMinimumThreshold
/ us-gaap_DebtInstrumentAxis
= bdc_RevolvingCreditFacilityMatureTwoThousandEighteenMember
                       
Term Loan                             250,000,000us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_DebtInstrumentAxis
= bdc_TermLoanDueTwoThousandAndTwentyMember
             
Term Loan, maturity year                             2020 2020            
Frequency of interest payments       Semiannually         Semiannually           Quarterly amortization payments         Semiannually   Semiannually
Quarterly amortization payments                             600,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= bdc_TermLoanDueTwoThousandAndTwentyMember
             
Effective interest rate of senior subordinated notes       9.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember
                    3.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= bdc_TermLoanDueTwoThousandAndTwentyMember
             
Payments of debt issuance costs 622,000us-gaap_PaymentsOfDebtIssuanceCosts 1,702,000us-gaap_PaymentsOfDebtIssuanceCosts           4,200,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
            3,900,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= bdc_TermLoanDueTwoThousandAndTwentyMember
      12,600,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
     
Aggregate principal amount outstanding of senior subordinated notes       5,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember
      200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
                247,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
388,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
  300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
700,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
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
5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember
5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember
5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
                    5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
    5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
Senior subordinated notes due date       2019 2019 2024 2024 2024                 2023 2023 2023     2022
Senior Subordinated Notes maturing 2019; description of priority       The notes rank equal in right of payment with our senior subordinated notes due 2024, 2023, and 2022, and with any future senior subordinated debt, and are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Term Loan and Revolver.         The 2024 Notes rank equal in right of payment with our senior subordinated notes due 2023, 2022 and 2019 and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Term Loan and Revolver.                     The 2023 Notes are guaranteed on a senior subordinated basis by certain of our subsidiaries. The notes rank equal in right of payment with our senior subordinated notes due 2024, 2022, and 2019 and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Term Loan Revolver   The 2022 Notes are guaranteed on a senior subordinated basis by certain of our subsidiaries. The 2022 Notes rank equal in right of payment with our senior subordinated notes due 2024, 2023, and 2019, and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Term Loan and Revolver.
Senior Subordinated Notes maturing 2019; description of priority       The 2019 notes are guaranteed on a senior subordinated basis by certain of our subsidiaries.         The 2024 Notes rank equal in right of payment with our senior subordinated notes due 2023, 2022 and 2019 and with any future subordinated debt, and they are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Term Loan and Revolver.                     The 2023 Notes are guaranteed on a senior subordinated basis by certain of our subsidiaries.   The 2022 Notes are guaranteed on a senior subordinated basis by certain of our subsidiaries.
Senior subordinated notes 1,460,516,000us-gaap_SubordinatedLongTermDebt   1,521,547,000us-gaap_SubordinatedLongTermDebt 5,221,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember
5,221,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember
200,000,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember
200,000,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember
                        555,300,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_DebtInstrumentAxis
= bdc_FivePointFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember
/ us-gaap_LongtermDebtTypeAxis
= bdc_SeniorSubordinateNotesMember
   
Fair value of debt instrument $ 1,510,900,000us-gaap_DebtInstrumentFairValue