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Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant Accounting Policies [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount | $ 200,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |
Debt and Capital Lease Obligations | 155,714,000 us-gaap_DebtAndCapitalLeaseObligations | 191,429,000 us-gaap_DebtAndCapitalLeaseObligations |
Depreciation expenses including capital leases | 145,800,000 us-gaap_Depreciation | 126,400,000 us-gaap_Depreciation | 109,800,000 us-gaap_Depreciation
Self-insurance reserve | 107,700,000 us-gaap_SelfInsuranceReserve | 100,400,000 us-gaap_SelfInsuranceReserve |
Long-term portions of self insurance reserve | 65,400,000 us-gaap_SelfInsuranceReserveNoncurrent | 61,600,000 us-gaap_SelfInsuranceReserveNoncurrent |
Advertising expense | 19,300,000 us-gaap_AdvertisingExpense | 16,700,000 us-gaap_AdvertisingExpense | 11,000,000 us-gaap_AdvertisingExpense
Long-term Debt, Fair Value | 165,500,000 us-gaap_LongTermDebtFairValue | 202,200,000 us-gaap_LongTermDebtFairValue |
Stock Repurchased During Period, Shares | 70,620 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |
Stock Repurchased and Retired During Period, Value | 5,532,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 194,500,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
Group Health Claims [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | 400,000 odfl_InsuranceMaximumPerOccurrence / us-gaap_LossContingenciesByNatureOfContingencyAxis = odfl_GroupHealthClaimsMember |  |
Self insurance additional coverage | 400,000 odfl_SelfInsuranceAdditionalCoverage / us-gaap_LossContingenciesByNatureOfContingencyAxis = odfl_GroupHealthClaimsMember |  |
Workers Compensation Claims [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | 1,000,000 odfl_InsuranceMaximumPerOccurrence / us-gaap_LossContingenciesByNatureOfContingencyAxis = odfl_WorkersCompensationClaimsMember |  |
Cargo Loss And Damage Claims [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | 100,000 odfl_InsuranceMaximumPerOccurrence / us-gaap_LossContingenciesByNatureOfContingencyAxis = odfl_CargoLossAndDamageClaimsMember |  |
Bodily Injury And Property Damage [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | $ 2,750,000 odfl_InsuranceMaximumPerOccurrence / us-gaap_LossContingenciesByNatureOfContingencyAxis = odfl_BodilyInjuryAndPropertyDamageMember |  |

X
- Definition Insurance Maximum, Per Occurrence + References No definition available. + Details
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Namespace Prefix: | odfl_
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Balance Type: | debit
Period Type: | duration

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- Definition Additional self insurance coverage in excess of the retention level. + References No definition available. + Details
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Namespace Prefix: | odfl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Balance Type: | credit
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer). + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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