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Leases - Future Lease Payments for Assets under Operating Leases, as well as Reconciliation to Lease Liability (Parenthetical) (Details) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
Lessee, operating lease, lease not yet commenced, payments due	$ 44.8

X

- Definition

Lessee, operating lease, lease not yet commenced, payments due.

+ References

No definition available.

+ Details

Name:	odfl_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue
Namespace Prefix:	odfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration