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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Rental deposits	$ 136us-gaap_DepositsAssetsCurrent	843us-gaap_DepositsAssetsCurrent	2,105us-gaap_DepositsAssetsCurrent
Prepayments	6,789us-gaap_PrepaidExpenseCurrent	42,120us-gaap_PrepaidExpenseCurrent	7,769us-gaap_PrepaidExpenseCurrent
Staff advances	392us-gaap_DueFromEmployeesCurrent	2,435us-gaap_DueFromEmployeesCurrent	867us-gaap_DueFromEmployeesCurrent
Interest receivable	1,940us-gaap_InterestReceivableCurrent	12,040us-gaap_InterestReceivableCurrent	1,602us-gaap_InterestReceivableCurrent
Receivables from third-party payment platform	1,980athm_ReceivableFromThirdPartyPaymentPlatform	12,283athm_ReceivableFromThirdPartyPaymentPlatform	0athm_ReceivableFromThirdPartyPaymentPlatform
Other receivables	675us-gaap_OtherReceivablesNetCurrent	4,190us-gaap_OtherReceivablesNetCurrent	944us-gaap_OtherReceivablesNetCurrent
Prepaid expenses and other current assets	$ 11,912us-gaap_PrepaidExpenseAndOtherAssetsCurrent	73,911us-gaap_PrepaidExpenseAndOtherAssetsCurrent	13,287us-gaap_PrepaidExpenseAndOtherAssetsCurrent

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- Definition

Amounts due from third-party payment service providers for clearing transactions and that are expected to be liquidated within one year or the normal operating cycle, if longer.

+ References

No definition available.

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- Definition

Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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- Definition

Amounts due from an Entity employee, not to include stockholders or officers, which are usually due within 1 year (or 1 business cycle).

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

-Publisher FASB

-Name Accounting Standards Codification

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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.8)

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The carrying amount of other receivables, net, due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed.

+ References

No definition available.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6509628



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