XML 49 R38.htm IDEA: XBRL DOCUMENT
v3.20.2

Accounts Receivable and Contract Assets (Additional Information) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Period that contracts in transit are outstanding | 10 days |
Threshold period for interest to bear on receivables | 60 days |
Allowance for doubtful accounts | $ 6.3 | $ 7.3
Auto loan receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Receivables, 60 days or less past due, percent | 95.00% |
Receivables, 60 days or less past due, non-accrual status, percent | 5.00% |
Allowance for doubtful accounts | $ 13.9 |

X
- Definition Accounts Receivable, Receipt of Payment, Period + References No definition available. + Details
Name: | lad_AccountsReceivableReceiptOfPaymentPeriod
Namespace Prefix: | lad_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accounts Receivable, Threshold To Bear Interest, Period + References No definition available. + Details
Name: | lad_AccountsReceivableThresholdToBearInterestPeriod
Namespace Prefix: | lad_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, 60 Days Or Less Past Due, Nonaccrual Percent + References No definition available. + Details
Name: | lad_FinancingReceivable60DaysOrLessPastDueNonaccrualPercent
Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Financing Receivable, 60 Days Or Less Past Due, Percent + References No definition available. + Details
Name: | lad_FinancingReceivable60DaysOrLessPastDuePercent
Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=lad_AutoLoansReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |