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Related Party Transactions - Additional Information (Detail) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2013 Telstra International HK Limited [Member] CNY	Dec. 31, 2014 Beijing Australian Telecommunications Technical Consulting Limited [Member] USD ($)	Dec. 31, 2014 Beijing Australian Telecommunications Technical Consulting Limited [Member] CNY	Dec. 31, 2013 Beijing Australian Telecommunications Technical Consulting Limited [Member] CNY	Dec. 31, 2014 Telstra International Limited [Member] USD ($)	Dec. 31, 2014 Telstra International Limited [Member] CNY	Dec. 31, 2013 Telstra International Limited [Member] CNY	Dec. 31, 2013 Autohome Media Limited [Member] CNY	Oct. 31, 2013 Autohome Media Limited [Member]
Related Party Transaction [Line Items]
Network maintenance services				128us-gaap_CostOfServicesMaintenanceCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalHkLimitedMember				$ 62us-gaap_CostOfServicesMaintenanceCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember	384us-gaap_CostOfServicesMaintenanceCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember	255us-gaap_CostOfServicesMaintenanceCosts / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember
Acquisition date											2013-10
The percentage of Autohome Media owned by the spouse of one of the Group's directors, prior to the acquisition												50.00%athm_OwnershipOwnedOfAcquiredEntity / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_AutohomeMediaLimitedMember
Related party payables outstanding	5us-gaap_DueToRelatedPartiesCurrent	33us-gaap_DueToRelatedPartiesCurrent	567us-gaap_DueToRelatedPartiesCurrent		0us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_BeijingAustralianTelecommunicationsTechnicalConsultingLimitedMember	0us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_BeijingAustralianTelecommunicationsTechnicalConsultingLimitedMember	149us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_BeijingAustralianTelecommunicationsTechnicalConsultingLimitedMember	5us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember	33us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember	418us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember	0us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_AutohomeMediaLimitedMember
Executive services on a part-time basis					$ 35us-gaap_SalariesWagesAndOfficersCompensation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_BeijingAustralianTelecommunicationsTechnicalConsultingLimitedMember	218us-gaap_SalariesWagesAndOfficersCompensation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_BeijingAustralianTelecommunicationsTechnicalConsultingLimitedMember	149us-gaap_SalariesWagesAndOfficersCompensation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_BeijingAustralianTelecommunicationsTechnicalConsultingLimitedMember	$ 43us-gaap_SalariesWagesAndOfficersCompensation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember	266us-gaap_SalariesWagesAndOfficersCompensation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember	418us-gaap_SalariesWagesAndOfficersCompensation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_TelstraInternationalLimitedMember

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- Definition

The percentage of Autohome Media owned by the spouse of one of the Group's directors, prior to the acquisition.

+ References

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Maintenance costs incurred and directly related to services rendered by an entity during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Expenditures for salaries for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

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