Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 04, 2018
Document And Entity Information [Abstract]
Document type	10-Q
Document period end date	Mar. 31, 2018
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 common stock shares outstanding		49,590,347
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	DIOD