Quarterly Financial Information (Unaudited) - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
Sep. 30, 2014	Jun. 30, 2014 store	Mar. 31, 2014	Dec. 31, 2014 store	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Financial advisory and legal costs	$ 385,000aan_FinancialAdvisoryandLegalExpenses	$ 12,400,000aan_FinancialAdvisoryandLegalExpenses	$ 872,000aan_FinancialAdvisoryandLegalExpenses	$ 13,661,000aan_FinancialAdvisoryandLegalExpenses	$ 0aan_FinancialAdvisoryandLegalExpenses	$ 0aan_FinancialAdvisoryandLegalExpenses
Restructuring Expenses	6,900,000			9,140,000	0	0
Progressive-related transaction costs	371,000	5,500,000	803,000	6,638,000	0	0
Reversal of lawsuit accrual	13,400,000	15,000,000		1,200,000	(28,400,000)	35,500,000
Retirement and vacation charges	9,100,000aan_RetirementBenefitsExpense	4,900,000aan_RetirementBenefitsExpense		9,094,000aan_RetirementBenefitsExpense	4,917,000aan_RetirementBenefitsExpense	10,394,000aan_RetirementBenefitsExpense
Impairment of leasehold improvement		2,300,000us-gaap_ImpairmentOfLeasehold
Number of store closures		44		44
Regulatory expense (income)	$ (1,200,000)aan_RegulatoryExpenseIncome

Financial Advisory and Legal Expenses

No definition available.

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- Definition

Regulatory Expense (Income)

+ References

No definition available.

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- Definition

Restructuring and Related Cost, Number of Store Closures

+ References

No definition available.

+ Details

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- Definition

Retirement Benefits Expense

+ References

No definition available.

+ Details

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460

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- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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- Definition

The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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- Definition

The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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