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Note 12 - Fair Value Measurements (Details) - Long-term Fixed Interest Rate Debt (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Long-term Fixed Interest Rate Debt [Abstract]
Carrying value	$ 257,780us-gaap_LongtermDebtPercentageBearingFixedInterestAmount	$ 132,616us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Fair value	$ 270,781us-gaap_LongTermDebtFairValue	$ 126,786us-gaap_LongTermDebtFairValue

X

- Details

Name:	lad_LongTermFixedInterestRateDebtAbstract
Namespace Prefix:	lad_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant