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Stock-Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Director [Member] | Non-Employee Director Equity Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = an_NonEmployeeDirectorEquityPlan2014Member / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Maximum aggregate grant date fair market value of awards per director for each calendar year	$ 750,000an_ShareBasedCompensationbyShareBasedPaymentAwardMaximumGrantDateFairValueperGrantee / us-gaap_PlanNameAxis = an_NonEmployeeDirectorEquityPlan2014Member / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Employee [Member] | 2008 Equity and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	12,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = an_EquityAndIncentivePlan2008Member / us-gaap_TitleOfIndividualAxis = an_EmployeeMember
Employee [Member] | 2008 Equity and Incentive Plan | Grant Awards, Other than Options, or Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = an_StockBasedAwardsEquityInstrumentsOtherThanOptionsAndStockAppreciationRightsSarsMember / us-gaap_PlanNameAxis = an_EquityAndIncentivePlan2008Member / us-gaap_TitleOfIndividualAxis = an_EmployeeMember

X

- Definition

The maximum aggregate grant date fair market value of share-based payments to be granted to each grantee during the calendar year.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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