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Restricted Net Assets - Additional Information (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY
Restricted Net Assets [Abstract]
Percentage of after tax profits allocated to general reserve	10.00%athm_PercentageOfProfitAfterTaxForAppropriationToGeneralReserve	10.00%athm_PercentageOfProfitAfterTaxForAppropriationToGeneralReserve
Percentage of maximum limit of registered capital to discontinue general reserve	50.00%athm_PercentageOfGeneralReserveFundOfRegisteredCapital	50.00%athm_PercentageOfGeneralReserveFundOfRegisteredCapital
Appropriated retained earnings	$ 1,424us-gaap_RetainedEarningsAppropriated	8,836us-gaap_RetainedEarningsAppropriated	7,113us-gaap_RetainedEarningsAppropriated	4,850us-gaap_RetainedEarningsAppropriated
Restricted net assets	$ 423,257us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries	2,626,141us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries	1,818,103us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries

X

- Definition

Represents the maximum percentage criteria expressed as a percentage of registered capital for the transfer of after-tax profit by subsidiaries in China to a general reserve fund. If the reserve fund exceeds the specified threshold of the registered capital, further appropriation is not required

+ References

No definition available.

+ Details

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X

- Definition

Represents the minimum percentage of after-tax profit transferred by Chinese subsidiaries to general reserve fund.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(e)(3)(ii))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph e

-Subparagraph 3

-Article 4

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X

- Definition

A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.30(a)(3)(i))

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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21332-112643



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.23(4))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21346-112643



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 24

-Subparagraph a(4)

-Article 7

+ Details

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