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Fair Value Measurement - Fair Value of Assets (Liabilities) Not Measured at Fair Value In Consolidated Balance Sheet - Additional Information (Details) (Long-term Debt, USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Long-term Debt
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long term debt, carrying value $ 400.0aan_LongTermDebtCarryingValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_LongTermDebtMember		 $ 400.0aan_LongTermDebtCarryingValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_LongTermDebtMember