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v3.20.1

Share-Based Compensation and Benefit Plans (Profit Sharing and Savings Plan) (Narrative) (Detail) - Profit sharing and savings plan [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Share-Based Compensation and Benefit Plans |  |
Profit sharing and savings plan, employer discretionary contribution | $ 0 | $ 0
Profit sharing and savings plan, cost recognized | $ 7,000 | $ 6,000
Employee's first 2% of contributed wages [Member] |  |
Share-Based Compensation and Benefit Plans |  |
Profit sharing and savings plan, Company match | 100.00% |
Employee's next 4% of contributed wages [Member] |  |
Share-Based Compensation and Benefit Plans |  |
Profit sharing and savings plan, Company match | 25.00% |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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- Details
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- Details
Name: | orly_ProfitSharingAndSavingsPlanPercentageMatchRangeAxis=orly_ProfitSharingAndSavingsPlanEmployeeNextFourPercentOfContributedWagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |