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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