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Note 12 - Segments (Details) - Segment Assets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Total assets:    
Total Assets $ 2,924,385us-gaap_Assets $ 2,880,932us-gaap_Assets
Operating Segments [Member] | Domestic [Member]    
Total assets:    
Total Assets 869,313us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lad_DomesticMember
831,574us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lad_DomesticMember
Operating Segments [Member] | Import [Member]    
Total assets:    
Total Assets 707,736us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lad_ImportMember
696,162us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lad_ImportMember
Operating Segments [Member] | Luxury [Member]    
Total assets:    
Total Assets 399,373us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lad_LuxuryMember
405,222us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= lad_LuxuryMember
Operating Segments [Member] | Corporate and Other [Member]    
Total assets:    
Total Assets $ 947,963us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 947,974us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember