v3.19.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Document And Entity Information [Abstract]    
Document type 10-Q  
Document period end date Jun. 30, 2019  
Amendment flag false  
Entity registrant name DIODES INC /DEL/  
Entity central index key 0000029002  
Current fiscal year end date --12-31  
Entity filer category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity common stock shares outstanding   50,996,162
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol DIOD  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 002-25577  
Entity Tax Identification Number 95-2039518  
Entity Address, Address Line One 4949 Hedgcoxe Road  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town Plano  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75024  
City Area Code 972  
Local Phone Number 987-3900  
Entity Incorporation, State or Country Code DE  
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock  
Security Exchange Name NASDAQ  
Document Quarterly Report true  
Document Transition Report false