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VARIABLE INTEREST ENTITIES (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Variable Interest Entities
Equity method investment in VIEs, net	$ 20.3
Investment tax credit amount		$ 108.3
Additional capital contributions	$ 160.0

X

- Definition

Amount of additional capital contributions to be made upon achievement of project milestones.

+ References

No definition available.

+ Details

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Namespace Prefix:	orly_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

No definition available

+ References

No definition available.

+ Details

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Namespace Prefix:	orly_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying amount of the reporting entity's equity method investment in a Variable Interest Entity included in the reporting entity's statement of financial position.

+ References

No definition available.

+ Details

Name:	orly_VariableInterestEntityEquityMethodInvestmentCarryAmount
Namespace Prefix:	orly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration