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Related Party Transactions (Details) (ESL Investments, Inc. [Member]) | Dec. 31, 2013
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ESL Investments, Inc. [Member] |
Related Party Transaction [Line Items] |
Majority ownership percentage in which agreements with manufacturers eliminate potential adverse consequences | 50.00%

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- Definition The maximum percentage threshold of shares owned by an investor not subject to voting or other restrictions under the terms of certain letter agreements with certain automotive manufacturers. + References No definition available. + Details
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Namespace Prefix: | an_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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