Document and Entity Information (USD $) Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Feb. 22, 2013	Jun. 30, 2012
Document And Entity Information [Abstract]
Document type	10-K
Document period end date	Dec. 31, 2012
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		46,018,715
Entity public float			$ 706,597,363
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY