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Income Taxes (Schedule of Components of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current deferred tax assets:    
Allowance for doubtful accounts $ 2,357us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 1,997us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Tax credits 3,250orly_TaxCreditCarryforwardCurrentTaxAsset 1,636orly_TaxCreditCarryforwardCurrentTaxAsset
Other accruals 67,468orly_DeferredTaxAssetsDeferredExpenseReservesAndAccrualsOtherCurrent 61,100orly_DeferredTaxAssetsDeferredExpenseReservesAndAccrualsOtherCurrent
Total current deferred tax assets 73,075us-gaap_DeferredTaxAssetsGrossCurrent 64,733us-gaap_DeferredTaxAssetsGrossCurrent
Noncurrent deferred tax assets:    
Tax credits 11,475us-gaap_TaxCreditCarryforwardDeferredTaxAsset 5,333us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Net operating losses 746orly_DeferredTaxAssetsOperatingLossCarryforwardsNoncurrent 1,180orly_DeferredTaxAssetsOperatingLossCarryforwardsNoncurrent
Other accruals 63,968orly_DeferredTaxAssetsDeferredExpenseReservesAndAccrualsOtherNoncurrent 59,176orly_DeferredTaxAssetsDeferredExpenseReservesAndAccrualsOtherNoncurrent
Other 16,468us-gaap_DeferredTaxAssetsOther 16,181us-gaap_DeferredTaxAssetsOther
Total noncurrent deferred tax assets 92,657us-gaap_DeferredTaxAssetsGrossNoncurrent 81,870us-gaap_DeferredTaxAssetsGrossNoncurrent
Total deferred tax assets 165,732us-gaap_DeferredTaxAssetsGross 146,603us-gaap_DeferredTaxAssetsGross
Current deferred tax liabilities:    
Inventories 90,333orly_DeferredTaxLiabilityCurrentInventory 84,955orly_DeferredTaxLiabilityCurrentInventory
Total current deferred tax liabilities 90,333us-gaap_DeferredTaxLiabilitiesGrossCurrent 84,955us-gaap_DeferredTaxLiabilitiesGrossCurrent
Noncurrent deferred tax liabilities:    
Property and equipment 139,604us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 131,851us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other 38,217us-gaap_DeferredTaxLiabilitiesOther 30,732us-gaap_DeferredTaxLiabilitiesOther
Total noncurrent deferred tax liabilities 177,821us-gaap_DeferredTaxLiabilitiesGrossNoncurrent 162,583us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Total deferred tax liabilities 268,154us-gaap_DeferredTaxLiabilities 247,538us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities $ (102,422)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (100,935)us-gaap_DeferredTaxAssetsLiabilitiesNet