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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended							12 Months Ended							2 Months Ended			12 Months Ended
	Dec. 31, 2014 USD ($) Segment	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY	Dec. 31, 2014 Credit Concentration Risk [Member] USD ($)	Dec. 31, 2014 Credit Concentration Risk [Member] CNY	Dec. 31, 2013 Credit Concentration Risk [Member] CNY	Dec. 31, 2014 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer	Dec. 31, 2013 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer	Dec. 31, 2014 Customer Concentration Risk [Member] Net Revenue [Member] Customer	Dec. 31, 2013 Customer Concentration Risk [Member] Net Revenue [Member] Customer	Dec. 31, 2012 Customer Concentration Risk [Member] Net Revenue [Member] Customer	Dec. 31, 2014 Consolidated VIEs [Member] USD ($)	Dec. 31, 2014 Consolidated VIEs [Member] CNY	Dec. 31, 2014 Beijing Prbrownies Software Co., Ltd. (formerly known as Beijing Autohome Software Co., Ltd.) [Member] Consolidated VIEs [Member]	Dec. 31, 2014 Subsidiaries [Member] USD ($)	Dec. 31, 2014 Subsidiaries [Member] CNY	Dec. 31, 2014 China [Member] Autohome WFOE [Member]	Dec. 31, 2013 China [Member] Autohome WFOE [Member]	Dec. 31, 2014 China [Member] Autohome Shanghai Advertising Co., Ltd. [Member]	Dec. 31, 2013 China [Member] Autohome Shanghai Advertising Co., Ltd. [Member]	Dec. 31, 2014 China [Member] Beijing Autohome Software Co., Ltd. [Member]	Dec. 31, 2013 China [Member] Beijing Autohome Software Co., Ltd. [Member]	Dec. 31, 2014 China [Member] Beijing Autohome Technologies Co., Ltd. [Member]	Dec. 31, 2013 China [Member] Beijing Autohome Technologies Co., Ltd. [Member]	Dec. 31, 2014 China [Member] Beijing Autohome Advertising Co., Ltd. [Member]	Dec. 31, 2013 China [Member] Beijing Autohome Advertising Co., Ltd. [Member]	Dec. 31, 2014 China [Member] Guangzhou Autohome Advertising Co., Ltd. [Member]	Dec. 31, 2013 China [Member] Guangzhou Autohome Advertising Co., Ltd. [Member]	Dec. 31, 2014 China [Member] Beijing Autohome Information Technology Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2013 China [Member] Beijing Autohome Information Technology Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2014 China [Member] Beijing Shengtuo Autohome Advertising Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2013 China [Member] Beijing Shengtuo Autohome Advertising Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2014 China [Member] Beijing Shengtuo Hongyuan Information Technology Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2013 China [Member] Beijing Shengtuo Hongyuan Information Technology Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2014 China [Member] Beijing Shengtuo Chengshi Advertising Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2013 China [Member] Beijing Shengtuo Chengshi Advertising Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2014 China [Member] Shanghai Youche Youjia Advertising Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2013 China [Member] Shanghai Youche Youjia Advertising Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2014 China [Member] Guangzhou Youche Youjia Advertising Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2013 China [Member] Guangzhou Youche Youjia Advertising Co., Ltd. [Member] Consolidated VIEs [Member]	Dec. 31, 2014 Maximum [Member]	Dec. 31, 2014 Maximum [Member] Term Deposits [Member]	Dec. 31, 2014 Minimum [Member] Term Deposits [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Exchange rate of one US$ to RMB	6.2046us-gaap_ForeignCurrencyExchangeRateTranslation1	6.2046us-gaap_ForeignCurrencyExchangeRateTranslation1
Original maturity period of term deposits																																										3 months	90 days	365 days
Goodwill, impairment loss	$ 0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Long-lived assets, impairment charge	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Recorded rebates and cash incentives to advertising agencies companies	63,691,000athm_RebatesToCustomers	395,175,000athm_RebatesToCustomers	231,136,000athm_RebatesToCustomers	153,388,000athm_RebatesToCustomers
Tax rate of value-added tax															17.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingPrbrowniesSoftwareCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember			6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_AutohomeWhollyForeignOwnedEnterpriseMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_AutohomeWhollyForeignOwnedEnterpriseMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_AutohomeShanghaiAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_AutohomeShanghaiAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingAutohomeSoftwareCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingAutohomeSoftwareCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingAutohomeTechnologiesCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingAutohomeTechnologiesCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingAutohomeAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingAutohomeAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_GuangzhouAutohomeAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_GuangzhouAutohomeAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingAutohomeInformationTechnologyCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingAutohomeInformationTechnologyCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingShengtuoAutohomeAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingShengtuoAutohomeAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingShengtuoHongyuanInformationTechnologyCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingShengtuoHongyuanInformationTechnologyCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingShengtuoChengshiAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_BeijingShengtuoChengshiAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_ShanghaiYoucheYoujiaAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_ShanghaiYoucheYoujiaAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_GuangzhouYoucheYoujiaAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	6.00%athm_ValueAddedTaxRate / dei_LegalEntityAxis = athm_GuangzhouYoucheYoujiaAdvertisingCompanyLimitedMember / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Value-added tax refund rate															14.00%athm_ValueAddedTaxRefundRate / dei_LegalEntityAxis = athm_BeijingPrbrowniesSoftwareCompanyLimitedMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Advertising expenditures	43,023,000us-gaap_AdvertisingExpense	266,942,000us-gaap_AdvertisingExpense	86,198,000us-gaap_AdvertisingExpense	37,858,000us-gaap_AdvertisingExpense
Product development expenses capitalized	0us-gaap_CapitalizedComputerSoftwareGross	0us-gaap_CapitalizedComputerSoftwareGross	0us-gaap_CapitalizedComputerSoftwareGross	0us-gaap_CapitalizedComputerSoftwareGross
Minimum percentage of estimated remaining economic life, Capital lease classification requirement	75.00%athm_MinimumPercentageOfEstimatedEconomicLifeOfLeasedProperty	75.00%athm_MinimumPercentageOfEstimatedEconomicLifeOfLeasedProperty
Minimum percentage of net present value of minimum lease payments over the fair value of leased property	90.00%athm_MinimumPercentageOfFairValueOfLeasedAssetsAsNetPresentValueToBeClassifiedUnderCapitalLease	90.00%athm_MinimumPercentageOfFairValueOfLeasedAssetsAsNetPresentValueToBeClassifiedUnderCapitalLease
Number of operating segment	1us-gaap_NumberOfOperatingSegments	1us-gaap_NumberOfOperatingSegments
Total expenses for employee benefits	9,917,000us-gaap_PensionAndOtherPostretirementBenefitExpense	61,532,000us-gaap_PensionAndOtherPostretirementBenefitExpense	23,410,000us-gaap_PensionAndOtherPostretirementBenefitExpense	13,666,000us-gaap_PensionAndOtherPostretirementBenefitExpense
Cash and cash equivalents, restricted cash and term deposits					446,796,000athm_CashAndCashEquivalentsRestrictedCashAndTermDeposits / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember	2,772,191,000athm_CashAndCashEquivalentsRestrictedCashAndTermDeposits / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember	1,383,613,000athm_CashAndCashEquivalentsRestrictedCashAndTermDeposits / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember
Credit risk, percentage								10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember		10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Number of customers represented greater than 10%								1athm_ConcentrationRiskNumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	1athm_ConcentrationRiskNumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	0athm_ConcentrationRiskNumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	0athm_ConcentrationRiskNumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	0athm_ConcentrationRiskNumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Cash and cash equivalents and term deposit													$ 27,067,000us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	167,938,000us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		$ 257,900,000us-gaap_CashCashEquivalentsAndShortTermInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,600,167,000us-gaap_CashCashEquivalentsAndShortTermInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Foreign currency exchange rate appreciation (depreciation)	(2.40%)athm_PercentageOfForeignCurrencyRateDevaluationAppreciationAgainstDomesticCurrency	(2.40%)athm_PercentageOfForeignCurrencyRateDevaluationAppreciationAgainstDomesticCurrency	2.90%athm_PercentageOfForeignCurrencyRateDevaluationAppreciationAgainstDomesticCurrency	1.00%athm_PercentageOfForeignCurrencyRateDevaluationAppreciationAgainstDomesticCurrency

X

- Definition

Cash and cash equivalents, term deposits and restricted cash deposited with financial institutions. Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. Restricted cash is the cash and cash equivalent items which are restricted as to withdrawal or usage.

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Concentration risk number of major customers.

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Minimum percentage of a lease's estimated remaining economic life required for determining for capital lease classification.

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Minimum percentage of fair value of leased assets as net present value to be classified under capital lease.

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Rate of appreciation or devaluation of foreign currency rate against domestic currency.

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Amount of reduction to gross sales revenue attributable to volume and other discounts with customers.

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Tax rate of value-added tax.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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

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-Name Accounting Standards Codification

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