Share-Based Compensation - Summary of Activity for PBRSUs for Employees (Parenthetical) (Details) - PBRSUs [Member]	12 Months Ended
Dec. 31, 2021
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grants as percentage of target award	0.00%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grants as percentage of target award	200.00%

Share-based compensation arrangement by share-based payment award equity instruments other than options, grants as a percentage of the target award in a period.

No definition available.

Name:	odfl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsPercentageOfTargetAwardInPeriod
Namespace Prefix:	odfl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration