XML 61 R44.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Description of Business and Summary of Significant Accounting Policies (Organization and Business, Inventory) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 brand stores franchises
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Owned and operated new vehicle franchises | franchises | 342
Number of stores | stores | 254
Number of brands | brand | 35
Percentage of new vehicle sales core brand vehicles | 95.00%

X
- Definition The number of new vehicle brands sold by the company's stores. + References No definition available. + Details
Name: | an_NumberOfBrands
Namespace Prefix: | an_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of owned and operated new vehicle franchises. + References No definition available. + Details
Name: | an_OwnedAndOperatedNewVehicleFranchises
Namespace Prefix: | an_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of new vehicles sold that represent the core brands of new vehicles sold by the company. + References No definition available. + Details
Name: | an_PercentageOfNewVehicleSalesCoreBrands
Namespace Prefix: | an_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration