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ACCRUED EXPENSES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Accrued expenses [Abstract]    
Sales commissions $ 2,776us-gaap_AccruedSalesCommissionCurrent $ 3,017us-gaap_AccruedSalesCommissionCurrent
Subcontracting labor 2,449belfb_AccruedSubcontractingLabor 2,217belfb_AccruedSubcontractingLabor
Salaries, bonuses and related benefits 14,944us-gaap_EmployeeRelatedLiabilitiesCurrent 17,964us-gaap_EmployeeRelatedLiabilitiesCurrent
Warranty accrual 4,333us-gaap_ProductWarrantyAccrualClassifiedCurrent 6,032us-gaap_ProductWarrantyAccrualClassifiedCurrent
Other 11,738us-gaap_OtherAccruedLiabilitiesCurrent 13,358us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses 36,240us-gaap_AccruedLiabilitiesCurrent 42,588us-gaap_AccruedLiabilitiesCurrent
Schedule of warranty accrual account for the period from the acquisition date [Roll Forward]    
Beginning balance as of beginning of period 6,032us-gaap_StandardProductWarrantyAccrual  
Charges and costs accrued 1,288belfb_StandardProductWarrantyAccrualChargesAndCostsAccrued  
Adjustments related to pre-existing warranties (including changes in estimates) (947)belfb_StandardProductWarrantyAccrualAdjustmentsRelatedToPreExistingWarrantiesIncludingChangesInEstimates  
Less repair costs incurred (523)us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease  
Less cash settlements (1,522)us-gaap_StandardProductWarrantyAccrualPayments  
Currency translation 5us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease  
Ending balance as of end of period $ 4,333us-gaap_StandardProductWarrantyAccrual  
Minimum [Member]    
Business Acquisition and Disposition [Line Items]    
Warranty period of product 1 year  
Maximum [Member]    
Business Acquisition and Disposition [Line Items]    
Warranty period of product 3 years