Document And Entity Information	6 Months Ended
	Jun. 30, 2012	Aug. 09, 2012
Document And Entity Information [Abstract]
Entity Registrant Name	OLD DOMINION FREIGHT LINE INC/VA
Entity Central Index Key	0000878927
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Trading Symbol	ODFL
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		57,443,324