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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Accumulated other comprehensive loss [Abstract] |  |  |
Foreign currency translation adjustment, net of taxes of ($302) and ($142) at March 31, 2015 and December 31, 2014, respectively | $ (19,729)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  | $ (9,365)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Unrealized holding gains on available-for-sale securities, net of taxes of $293 and $259 as of March 31, 2015 and December 31, 2014, respectively | 483 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  | 429 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Unfunded SERP liability, net of taxes of ($1,297) and ($1,325) as of March 31, 2015 and December 31, 2014, respectively | (2,962)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |  | (3,026)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive loss, tax [Abstract] |  |  |
Foreign currency translation adjustment, tax | (302)belfb_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTaxEffect |  | (142)belfb_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTaxEffect
Unrealized holding gains on available-for-sale securities, tax | 293 belfb_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxEffect |  | 259 belfb_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxEffect
Unfunded SERP liability, tax | (1,297)belfb_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect |  | (1,325)belfb_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward] |  |  |
Balance at beginning of period | (11,962)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Other comprehensive (loss) income before reclassifications | (10,310)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax |  |
Amount reclassified from accumulated other comprehensive loss | 64 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |  |
Net current period other comprehensive (loss) income | (10,246)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |
Balance at end of period | (22,208)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Foreign Currency Translation Adjustment [Member] |  |  |
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward] |  |  |
Balance at beginning of period | (9,365)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Other comprehensive (loss) income before reclassifications | (10,364)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Amount reclassified from accumulated other comprehensive loss | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Net current period other comprehensive (loss) income | (10,364)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Balance at end of period | (19,729)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Unrealized Holding Gains on Available-for-Sale Securities [Member] |  |  |
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward] |  |  |
Balance at beginning of period | 429 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Other comprehensive (loss) income before reclassifications | 54 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Amount reclassified from accumulated other comprehensive loss | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Net current period other comprehensive (loss) income | 54 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Balance at end of period | 483 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
Unfunded SERP Liability [Member] |  |  |
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward] |  |  |
Balance at beginning of period | (3,026)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |  |
Other comprehensive (loss) income before reclassifications | 0 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |  |
Amount reclassified from accumulated other comprehensive loss | 64 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | [1] |
Net current period other comprehensive (loss) income | 64 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |  |
Balance at end of period | $ (2,962)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |  |
[1] | This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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