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Description of Business and Summary of Significant Accounting Policies (Organization and Business, Inventory) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 brand franchises stores | Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Owned and operated new vehicle franchises | 269 |
Number of stores | 228 |
Number of brands | 33 |
Percentage of new vehicle sales core brand vehicles | 95.00% |
Floorplan interest assistance, inventory cost reduction | $ 19.7 | $ 15.8

X
- Definition The amount of floorplan assistance received from manufacturers for new vehicles in inventory as of period-end. The amount is reflected as a reduction to new vehicle inventory cost. + References No definition available. + Details
Name: | an_FloorplanAssistanceInventoryCostReduction
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- Details
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