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Significant Accounting Policies Significant Accounting Policies (Supplemental Cash Flow Information) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]      
Supplemental Assets Acquired Under Capital Leases $ 0odfl_SupplementalAssetsAcquiredUnderCapitalLeases $ 0odfl_SupplementalAssetsAcquiredUnderCapitalLeases $ 1,094,000odfl_SupplementalAssetsAcquiredUnderCapitalLeases
Noncash or Part Noncash Acquisition, Fixed Assets Acquired   6,600,000us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1  
Other Noncash Income   $ 3,400,000us-gaap_OtherNoncashIncome