Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies Significant Accounting Policies (Supplemental Cash Flow Information) (Details)

v2.4.1.9
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