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Long-Term Debt (Restrictions and Covenants) (Details) (USD $) | Dec. 31, 2013
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Debt Instrument [Line Items] |
The maximum threshold of letters of credit excluded from the leverage ratio calculation | $ 150,000,000
Capitalization ratio calculation, additions to shareholders' equity | $ 1,520,000,000
Maximum Ratio Requirement [Member] |
Debt Instrument [Line Items] |
Capitalization ratio | 65.00%
Leverage ratio | 3.75
Debt Covenant, Actual Ratio [Member] |
Debt Instrument [Line Items] |
Capitalization ratio | 57.60%
Leverage ratio | 2.25

X
- Definition An amount contractually defined in the credit agreement as principally reflecting vehicle floorplan payable and non-vehicle debt divided by the company's total capitalization including vehicle floorplan payable and certain adjustments. Under the credit agreement, the company is required to remain in compliance with a maximum capitalization ratio. + References No definition available. + Details
Name: | an_DebtCovenantCapitalizationRatio
Namespace Prefix: | an_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Under the credit agreement, the amount added to shareholders' equity in the calculation of the capitalization ratio. + References No definition available. + Details
Name: | an_DebtCovenantCapitalizationRatioCalculationAdditionsToShareholdersEquity
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Under the terms of the credit agreement, the maximum amount of letters of credit excluded from the definition of debt used in the calculation of the leverage ratio. + References No definition available. + Details
Name: | an_DebtCovenantLettersOfCreditExcludedFromDebtLeverageRatioCovenant
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition An amount contractually defined in the credit agreement as principally reflecting non-vehicle debt divided by a contractually defined measure of earnings with certain adjustments. Under the credit agreement, the company is required to remain in compliance with a maximum leverage ratio. + References No definition available. + Details
Name: | an_DebtCovenantLeverageRatio
Namespace Prefix: | an_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration