XML 149 R126.htm IDEA: XBRL DOCUMENT
v3.25.0.1

SHARE-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - Employee Benefit Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum annual contributions per employee, percent | 75.00% |  |
Maximum annual contribution per employee | $ 23,000 |  |
Minimum age requirement | 50 years |  |
Employer matching contribution, employment requirement period for matching eligibility, minimum | 1 year |  |
Employer matching contribution after one year of employment, percent | 50.00% |  |
Employer matching contribution, percent of employees' gross pay | 6.00% |  |
Vesting period | 4 years |  |
Employer matching contributions | $ 18,400,000 | $ 16,000,000.0 | $ 18,000,000.0
Age 50 or More |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum annual contribution per employee | $ 30,500 |  |

X
- Definition Define Contribution Plan, Minimum Age Requirement + References No definition available. + Details
Name: | abg_DefineContributionPlanMinimumAgeRequirement
Namespace Prefix: | abg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Employer Matching Contribution, Employment Requirement Period for Matching Eligibility, Minimum + References No definition available. + Details
Name: | abg_DefinedContributionPlanEmployerMatchingContributionEmploymentRequirementPeriodForMatchingEligibilityMinimum
Namespace Prefix: | abg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Employers Matching Contribution, Vesting Period + References No definition available. + Details
Name: | abg_DefinedContributionPlanEmployersMatchingContributionVestingPeriod
Namespace Prefix: | abg_
Data Type: | xbrli:durationItemType
Balance Type: | na
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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | abg_EmployeeRetirementPlanGroupsOfParticipantsAxis=abg_AgeFiftyOrMoreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |