XML 28 R65.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 21, 2019 shares | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) vote $ / shares shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares | Oct. 22, 2018 shares
Class of Stock [Line Items] |  |  |  |  |  |
Shares repurchased in association with tax withholdings on the vesting of RSUs (in shares) |  |  | 40,356 | 30,119 | 32,457 |
Payments for repurchase of capped call options | $ |  | $ 36.5 |  |  |  |
Proceeds received from capped call options expirations | $ |  |  | $ 38.9 |  |  |
Class A common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Conversion of common stock (in shares) |  |  | 1 |  |  |
Common stock number of votes | vote |  |  | 1 |  |  |
Additional amount authorized to be repurchased |  |  |  |  |  | 250,000,000
Class A common stock | Restricted Stock Units (RSUs) |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Treasury stock acquired, average cost (in dollars per share) | $ / shares |  |  | $ 80.39 |  |  |
Adjustments related to tax withholding for share-based compensation | $ |  |  | $ 3.2 |  |  |
Class A common stock | The 2016 Stock Repurchase Authorization |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Remaining authorized repurchase amount | $ |  |  | $ 233.6 |  |  |
Class B common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percentage of Class B common to total common stock subject to automatic conversion |  |  | 1.00% |  |  |
Common stock number of votes | vote |  |  | 10 |  |  |
Number of shares that were agreed to be converted (in shares) | 1,000,000 |  |  |  |  |
Percent of shares required to be converted by the end of every two years | 15.00% |  |  |  |  |
Stock conversion, term | 2 years |  |  |  |  |
Percent of shares required to be converted by December 31, 2020 | 15.00% |  |  |  |  |
Percent of shares required to be converted by December 31, 2022 | 30.00% |  |  |  |  |
Percent of shares required to be converted by December 31, 2024 | 45.00% |  |  |  |  |
Number of shares issued in transaction |  |  | 600,000 |  |  |

X
- Definition Represents the number of votes per class of common stock. + References No definition available. + Details
Name: | lad_CommonStockNumberOfVotes
Namespace Prefix: | lad_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of shares of one class common stock shares convertible into another class of common stock. + References No definition available. + Details
Name: | lad_ConversionOfCommonStockShares
Namespace Prefix: | lad_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Shares To Be Converted + References No definition available. + Details
Name: | lad_NumberOfSharesToBeConverted
Namespace Prefix: | lad_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payments For Repurchase Of Capped Call Options + References No definition available. + Details
Name: | lad_PaymentsForRepurchaseOfCappedCallOptions
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percent Of Shares Converted By The End Of Every Two Years + References No definition available. + Details
Name: | lad_PercentOfSharesConvertedByTheEndOfEveryTwoYears
Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent Of Shares To Be Converted, Tranche One + References No definition available. + Details
Name: | lad_PercentOfSharesToBeConvertedTrancheOne
Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent Of Shares To Be Converted, Tranche Three + References No definition available. + Details
Name: | lad_PercentOfSharesToBeConvertedTrancheThree
Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent Of Shares To Be Converted, Tranche Two + References No definition available. + Details
Name: | lad_PercentOfSharesToBeConvertedTrancheTwo
Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage number of shares of Class B common stock outstanding representing less than 1% of the total number of shares of common stock outstanding that would be subject to automatic conversion. + References No definition available. + Details
Name: | lad_PercentageOfClassBCommonToTotalCommonStockSubjectToAutomaticConversion
Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds From Capped Call Options Expirations + References No definition available. + Details
Name: | lad_ProceedsFromCappedCallOptionsExpirations
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Stock Conversion, Term + References No definition available. + Details
Name: | lad_StockConversionTerm
Namespace Prefix: | lad_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Repurchase Program, Additional Authorized Amount + References No definition available. + Details
Name: | lad_StockRepurchaseProgramAdditionalAuthorizedAmount
Namespace Prefix: | lad_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
Name: | us-gaap_SharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
Name: | us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=lad_The2016StockRepurchaseAuthorizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |