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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 21, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol ODFL    
Entity Registrant Name OLD DOMINION FREIGHT LINE, INC.    
Entity Central Index Key 0000878927    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   212,545,079  
Entity Public Float     $ 33,407,884,515
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer Yes    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock ($0.10 par value)    
Security Exchange Name NASDAQ    
Entity File Number 0-19582    
Entity Incorporation, State or Country Code VA    
Entity Tax Identification Number 56-0751714    
Entity Address, Address Line One 500 Old Dominion Way    
Entity Address, City or Town Thomasville    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 27360    
City Area Code 336    
Local Phone Number 889-5000    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

Certain portions of the Company’s Proxy Statement for the 2025 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.

    
Auditor Name Ernst & Young LLP    
Auditor Location Raleigh, North Carolina    
Auditor Firm ID 42    
Auditor Opinion [Text Block]

We have audited the accompanying balance sheets of Old Dominion Freight Line, Inc. (the Company) as of December 31, 2024 and 2023, the related statements of operations, changes in shareholders' equity and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and financial statement schedule listed in the Index at Item 15(a)(2) (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.

 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 25, 2025 expressed an unqualified opinion thereon.