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INCOME TAXES (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Income taxes payable | $ 37,000 us-gaap_LiabilityForUncertainTaxPositionsCurrent |  | $ 203,000 us-gaap_LiabilityForUncertainTaxPositionsCurrent
Liability for uncertain tax positions | 40,781,000 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  | 39,767,000 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Unrecognized tax benefit | 40,818,000 us-gaap_UnrecognizedTaxBenefits |  | 39,970,000 us-gaap_UnrecognizedTaxBenefits
Liability for uncertain tax position that would impact effective tax rate | 2,900,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  | 2,800,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Interest and penalties uncertain tax positions recognized | 900,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |
Accrued interest and penalties uncertain tax positions | 2,500,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  | 1,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Deferred tax liability, net | 7,500,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |
Power Solutions [Member] |  |  |
Income Taxes [Line Items] |  |  |
Interest and penalties uncertain tax positions recognized | 2,100,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Interest and penalties uncertain tax positions recognized until various tax matters are resolved | 2,500,000 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Deferred tax assets | 7,100,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Deferred tax liability | 3,100,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |  |
Connectivity Solutions [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred tax assets | 1,200,000 us-gaap_DeferredTaxAssetsGross / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |
Deferred tax liability | 16,400,000 us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = belfb_EmersonNetworkPowerConnectivitySolutionsMember |  |
Asia [Member] | Power Solutions [Member] |  |  |
Income Taxes [Line Items] |  |  |
Additions relating to acquisitions |  |  | 35,800,000 belfb_AdditionsRelatingToAcquisitions / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Foreign jurisdictions [Member] | Asia [Member] | Power Solutions [Member] |  |  |
Income Taxes [Line Items] |  |  |
Additions relating to acquisitions |  |  | $ 12,000,000 belfb_AdditionsRelatingToAcquisitions / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember

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