Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.20.1
Document And Entity Information - shares
3 Months Ended
Mar. 31, 2020
May 01, 2020
Cover [Abstract]    
Entity Registrant Name OLD DOMINION FREIGHT LINE, INC.  
Entity Central Index Key 0000878927  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Trading Symbol ODFL  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Common Stock, Shares Outstanding   117,948,168
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 0-19582  
Entity Incorporation, State or Country Code VA  
Entity Tax Identification Number 56-0751714  
Entity Address, Postal Zip Code 27360  
Entity Address, Address Line One 500 Old Dominion Way  
Entity Address, City or Town Thomasville  
Entity Address, State or Province NC  
City Area Code 336  
Local Phone Number 889-5000  
Security Exchange Name NASDAQ  
Title of 12(b) Security Common Stock ($0.10 par value)  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false