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Organization - Schedule of Principal Subsidiaries of Company (Detail) (Subsidiaries [Member])	12 Months Ended
	Dec. 31, 2014
Cheerbright International Holdings, Ltd [Member]
Organization [Line Items]
Date of incorporation or acquisition	Jun. 13, 2006
Place of incorporation	British Virgin Islands
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_CheerbrightInternationalHoldingsLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Investment holding
Autohome (Hong Kong) Ltd. [Member]
Organization [Line Items]
Date of incorporation or acquisition	Mar. 16, 2012
Place of incorporation	Hong Kong
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_AutohomeHkLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of online advertising services
Autohome Media Limited [Member]
Organization [Line Items]
Date of incorporation or acquisition	Oct. 18, 2013
Place of incorporation	Hong Kong
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_AutohomeMediaLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of online advertising services
Beijing Cheerbright Technologies Co., Ltd. [Member]
Organization [Line Items]
Date of incorporation or acquisition	Sep. 01, 2006
Place of incorporation	PRC
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_BeijingCheerbrightTechnologyCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of technical and consulting services
Autohome Shanghai Advertising Co., Ltd. [Member]
Organization [Line Items]
Date of incorporation or acquisition	Sep. 29, 2013
Place of incorporation	PRC
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_AutohomeShanghaiAdvertisingCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of online advertising services
Beijing Prbrownies Software Co., Ltd. (formerly known as Beijing Autohome Software Co., Ltd.) [Member]
Organization [Line Items]
Date of incorporation or acquisition	Nov. 12, 2013
Place of incorporation	PRC
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_BeijingPrbrowniesSoftwareCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of information technology services
Beijing Autohome Technologies Co., Ltd. [Member]
Organization [Line Items]
Date of incorporation or acquisition	Nov. 12, 2013
Place of incorporation	PRC
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_BeijingAutohomeTechnologiesCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of information technology services
Beijing Autohome Advertising Co., Ltd. [Member]
Organization [Line Items]
Date of incorporation or acquisition	Nov. 13, 2013
Place of incorporation	PRC
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_BeijingAutohomeAdvertisingCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of online advertising services
Guangzhou Autohome Advertising Co., Ltd. [Member]
Organization [Line Items]
Date of incorporation or acquisition	Nov. 25, 2013
Place of incorporation	PRC
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_GuangzhouAutohomeAdvertisingCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of online advertising services
Tianjin Autohome Technologies Co., Ltd. [Member]
Organization [Line Items]
Date of incorporation or acquisition	Oct. 20, 2014
Place of incorporation	PRC
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_TianjinAutohomeTechnologiesCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of information technology services
Autohome (Tianjin) Automobile Sales Co., Ltd. [Member]
Organization [Line Items]
Date of incorporation or acquisition	Oct. 20, 2014
Place of incorporation	PRC
Percentage of direct ownership by the Company	100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_AutohomeTianjinAutomobileSalesCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember
Principal activities	Provision of automobile and component parts sales service

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