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Share-Based Compensation and Benefit Plans (Other Share-Based Compensation) (Narrative) (Details) - Employee stock purchase plan [Member] | 9 Months Ended
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Sep. 30, 2020
Share-Based Compensation and Benefit Plans |
Employee stock purchase plan stock purchase percentage | 85.00%
Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Vesting period | 3 years

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- Definition Percent of fair market value of Company's common stock that eligible employees, participating in employee stock purchase plan, may purchase the stock at within the plan. + References No definition available. + Details
Name: | orly_EmployeeStockPurchasePlanStockPurchasePercentage
Namespace Prefix: | orly_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent an arrangement under which an individual receives compensation benefits. Such an arrangement is usually provided to employees to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References No definition available. + Details
Name: | orly_OtherCompensationAndBenefitPlansLineItems
Namespace Prefix: | orly_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=orly_EmployeeStockPurchasePlanMember
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Data Type: | na
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Period Type: |

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- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |