Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 09, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document type	10-K
Document period end date	Dec. 31, 2017
Amendment flag	false
Entity registrant name	DIODES INC /DEL/
Entity central index key	0000029002
Entity current reporting status	Yes
Entity voluntary filers	No
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity well known seasoned issuer	Yes
Entity common stock shares outstanding		49,140,136
Entity public float			$ 714,636,068
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	DIOD