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Organization - Schedule of VIEs (Detail) (Consolidated VIEs [Member])	12 Months Ended
	Dec. 31, 2014
Beijing Autohome Information Technology Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Aug. 28, 2006
Place of incorporation	PRC
Percentage of direct ownership by the Company	0.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = athm_BeijingAutohomeInformationTechnologyCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Principal activities	Provision of online advertising and dealer subscription services
Beijing Shengtuo Autohome Advertising Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Sep. 21, 2010
Place of incorporation	PRC
Percentage of direct ownership by the Company	0.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = athm_BeijingShengtuoAutohomeAdvertisingCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Principal activities	Provision of online advertising services
Beijing Shengtuo Hongyuan Information Technology Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Nov. 08, 2010
Place of incorporation	PRC
Percentage of direct ownership by the Company	0.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = athm_BeijingShengtuoHongyuanInformationTechnologyCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Principal activities	Provision of online advertising and dealer subscription services
Beijing Shengtuo Chengshi Advertising Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Nov. 12, 2010
Place of incorporation	PRC
Percentage of direct ownership by the Company	0.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = athm_BeijingShengtuoChengshiAdvertisingCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Principal activities	Provision of online advertising services
Shanghai Youche Youjia Advertising Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Dec. 31, 2011
Place of incorporation	PRC
Percentage of direct ownership by the Company	0.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = athm_ShanghaiYoucheYoujiaAdvertisingCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Principal activities	Provision of online advertising services
Guangzhou Youche Youjia Advertising Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	May 08, 2012
Place of incorporation	PRC
Percentage of direct ownership by the Company	0.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = athm_GuangzhouYoucheYoujiaAdvertisingCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Principal activities	Provision of online advertising services

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- Definition

Date when an entity was incorporated

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- Definition

State or Country Name where an entity is incorporated

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 5A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685

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Description of the transactions or business conducted by the Variable Interest Entity (VIE), including how the VIE is financed.

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-Name Accounting Standards Codification

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