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Note 10 - Contingencies (Details Textual) - Subsequent Event [Member] - In Re Lithia Motors Derivative Litigation [Member] $ in Millions	Apr. 26, 2017 USD ($)
Litigation Settlement, Amount Awarded to Other Party	$ 1
Litigation Settlement, Required Compensation Disclosure of Executive Officers, Term	5 years
Litigation Settlement, Required Number of Independent Director Not a Member of Both Committees	1
Litigation Settlement, Maximum Number of Consecutive Years a Director Serves as Chair of a Board Committee	4 years
Litigation Settlement, Maximum Number of Years To Be Considered Independent	15 years
Litigation Settlement, Maximum Independent Director Age	79
Litigation Settlement, Number of Independent Directors, Year Three	5
Litigation Settlement, Annual Threshold Life-time Compensation for Executive Officers with Shareholders Approval	$ 1
Litigation Settlement, Threshold Amount of Related Party Transaction Reviewed By Audit Comittee	$ 1

X

- Definition

The threshold amount of life-time compensation for named executive officers subject to shareholders approval, according to the litigation settlement.

+ References

No definition available.

+ Details

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

X

- Definition

The maximum age for an independent director to serve, according to the litigation settlement.

+ References

No definition available.

+ Details

Name:	lad_LitigationSettlementMaximumIndependentDirectorAge
Namespace Prefix:	lad_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum number of consecutive years a director can serve as a chair of a board committee in settlement of litigation.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum number of years the director can serve on the board and still be considered independent according to the litigation settlement.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of independent director who is not a member of both the audit and compensation committees, according to the litigation settlement.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of independent directors in three years from the settlement date.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Period of time when compensation of named executive officers will be disclosed according to the litigation settlement.

+ References

No definition available.

+ Details

Name:	lad_LitigationSettlementRequiredCompensationDisclosureOfExecutiveOfficersTerm
Namespace Prefix:	lad_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The threshold amount of transactions with related party reviewed by the audit committee of the board during the financial reporting period, according to the litigation settlement.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LitigationCaseAxis=lad_InReLithiaMotorsDerivativeLitigationMember
Namespace Prefix:
Data Type:	na
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Period Type: