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Subsequent Events (Details)	Jan. 25, 2017 $ / shares
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Declared after the Financial Statement Date, Per Share	$ 0.10

X

- Definition

Amount of dividends declared after the financial statement date, but before the issuance of the financial statements reported as a subsequent event.

+ References

No definition available.

+ Details

Name:	odfl_DividendsDeclaredAfterFinancialStatementDatePerShare
Namespace Prefix:	odfl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: