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Income Tax Provision - Additional Information (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
INCOME TAX PROVISION $ 4,187,000us-gaap_IncomeTaxExpenseBenefit $ 2,547,000us-gaap_IncomeTaxExpenseBenefit  
Effective tax rate 26.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 19.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 23.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Estimated Annual Income Tax Rate 25.00%diod_EstimatedAnnualIncomeTaxRate    
U.S. statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Domestic pre-tax income/(loss) (6,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic    
Foreign pre-tax income/(loss) 22,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign    
Tax holidays 1,000,000us-gaap_IncomeTaxHolidayAggregateDollarAmount 1,000,000us-gaap_IncomeTaxHolidayAggregateDollarAmount  
Tax holidays basic EPS $ 0.02diod_IncomeTaxHolidayIncomeTaxBenefitsPerShareBasic $ 0.02diod_IncomeTaxHolidayIncomeTaxBenefitsPerShareBasic  
Tax holidays diluted EPS $ 0.02diod_IncomeTaxHolidayIncomeTaxBenefitsPerShareDiluted $ 0.02diod_IncomeTaxHolidayIncomeTaxBenefitsPerShareDiluted  
Unrecognized tax benefits $ 19,000,000us-gaap_UnrecognizedTaxBenefits    
Significant Change in Unrecognized Tax Benefits, Nature of Event It is reasonably possible that the amount of the unrecognized benefit with respect to certain of our unrecognized tax positions will significantly increase or decrease within the next 12 months.    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range Not Possible At this time, an estimate of the range of the reasonably possible outcomes cannot be made.