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Note 13 - Subsequent Events (Details Textual) - Subsequent Event [Member] $ / shares in Units, $ in Millions	Jul. 25, 2016 USD ($) $ / shares	Jul. 27, 2016 USD ($)
Common Class A [Member]
Common Stock, Dividends, Per Share, Declared | $ / shares	$ 0.25
Common Class B [Member]
Common Stock, Dividends, Per Share, Declared | $ / shares	$ 0.25
Syndicated Credit Facility [Member] | Used Vehicle Inventory Financing [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 350.0
Syndicated Credit Facility [Member] | General Corporate Purposes [Member]
Line of Credit Facility, Maximum Borrowing Capacity		400.0
Syndicated Credit Facility [Member] | Scenario Subject to Lender Approval [Member]
Line of Credit Facility, Maximum Borrowing Capacity		2,400.0
Syndicated Credit Facility [Member]
Increase in Line of Credit Facility Maximum Borrowing Capacity		300.0
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,050.0
Number of Financial Institutions		18
Number of Manufacturer Affiliated Finance Companies		8
Dividends, Common Stock, Cash	$ 6.4

X

- Definition

The amount of increased maximum borrowing capacity of a line of credit facility.

+ References

No definition available.

+ Details

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

X

- Definition

The number of financial institutions.

+ References

No definition available.

+ Details

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

X

- Definition

The number of manufacturer affiliated finance companies.

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

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Balance Type:
Period Type:

X

- Details

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X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_CreditFacilityAxis=lad_GeneralCorporatePurposesMember
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Data Type:	na
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Period Type:

X

- Details

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Period Type: