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Organization - Additional Information (Detail)
0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended
Nov. 04, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Dec. 31, 2013
American Depositary Shares [Member]
IPO [Member]
USD ($)
Nov. 30, 2014
American Depositary Shares [Member]
Follow-on offering [Member]
USD ($)
Dec. 31, 2014
Class A Ordinary Shares [Member]
Dec. 31, 2013
Class A Ordinary Shares [Member]
Dec. 31, 2012
Class A Ordinary Shares [Member]
Dec. 31, 2014
Class A Ordinary Shares [Member]
IPO [Member]
Dec. 31, 2014
Class B Ordinary Shares [Member]
Dec. 31, 2013
Class B Ordinary Shares [Member]
Dec. 31, 2014
Advertising Services [Member]
Dec. 31, 2014
Internet Content Provider Business [Member]
Maximum [Member]
Dec. 31, 2014
VIE Structure Concentration Risk [Member]
Net Revenue [Member]
Dec. 31, 2013
VIE Structure Concentration Risk [Member]
Net Revenue [Member]
Dec. 31, 2012
VIE Structure Concentration Risk [Member]
Net Revenue [Member]
Dec. 31, 2014
VIE Structure Concentration Risk [Member]
Assets, Total [Member]
Dec. 31, 2013
VIE Structure Concentration Risk [Member]
Assets, Total [Member]
Dec. 31, 2014
VIE Structure Concentration Risk [Member]
Liabilities, Total [Member]
Dec. 31, 2013
VIE Structure Concentration Risk [Member]
Liabilities, Total [Member]
Dec. 31, 2014
Consolidated VIEs [Member]
USD ($)
Dec. 31, 2014
Consolidated VIEs [Member]
CNY
Dec. 31, 2013
Consolidated VIEs [Member]
CNY
Dec. 31, 2014
Exclusive technical consulting and service agreements [Member]
Nov. 04, 2013
Telstra Holdings Pty Ltd. [Member]
USD ($)
Dec. 31, 2014
Telstra Holdings Pty Ltd. [Member]
Jun. 27, 2008
Telstra Holdings Pty Ltd. [Member]
Jun. 23, 2008
Telstra Holdings Pty Ltd. [Member]
Dec. 31, 2014
Telstra Holdings Pty Ltd. [Member]
Maximum [Member]
Jun. 27, 2008
Selling Shareholders of Cheerbright, China Topside and Norstar [Member]
Nov. 04, 2013
West Crest Limited [Member]
Installment
Summary of Investment Holdings [Line Items]                                                                  
Percentage of the Company owned by Telstra                                                       55.90%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= athm_TelstraHoldingsProprietaryLimitedMember
55.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= athm_TelstraHoldingsProprietaryLimitedMember
100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= athm_TelstraHoldingsProprietaryLimitedMember
51.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= athm_TelstraHoldingsProprietaryLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Percentage of the Company owned by selling shareholders                                                               45.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= athm_SellingShareholdersMember
 
Ordinary shares purchased                                                     2,828,147us-gaap_StockRepurchasedDuringPeriodShares
/ dei_LegalEntityAxis
= athm_TelstraHoldingsProprietaryLimitedMember
           
Ordinary shares purchased, value                                                     $ 55,000,000us-gaap_StockRepurchasedDuringPeriodValue
/ dei_LegalEntityAxis
= athm_TelstraHoldingsProprietaryLimitedMember
           
Ordinary shares repurchased and retired 3,856,564us-gaap_StockRepurchasedAndRetiredDuringPeriodShares                                                                
Ordinary shares repurchased and retired, value 75,000,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue     457,350,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue                                                          
Number of installments to be paid in cash                                                                 2athm_NumberOfInstallment
/ dei_LegalEntityAxis
= athm_WestCrestLimitedMember
Newly issued shares through offering           8,993,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= athm_AmericanDepositarySharesMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
2,424,801us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= athm_AmericanDepositarySharesMember
/ us-gaap_SubsidiarySaleOfStockAxis
= athm_FollowOnOfferingMember
      8,993,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
                                           
Proceeds from issuance of shares   97,344,000us-gaap_ProceedsFromIssuanceOfCommonStock 603,980,000us-gaap_ProceedsFromIssuanceOfCommonStock 863,200,000us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock 142,590,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= athm_AmericanDepositarySharesMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
97,344,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= athm_AmericanDepositarySharesMember
/ us-gaap_SubsidiarySaleOfStockAxis
= athm_FollowOnOfferingMember
                                                   
Shares converted into Class A ordinary shares from Class B ordinary shares during the period               6,964,612athm_SharesConvertedIntoClassaOrdinarySharesFromClassbOrdinarySharesDuringThePeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
0athm_SharesConvertedIntoClassaOrdinarySharesFromClassbOrdinarySharesDuringThePeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
0athm_SharesConvertedIntoClassaOrdinarySharesFromClassbOrdinarySharesDuringThePeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
                                             
Ordinary shares outstanding               48,777,835us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
36,347,496us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
    61,824,328us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
68,788,940us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
                                       
Term of agreement                                                   30 years              
Extension option in agreement term                                                   10 years              
Ownership percentage                             50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= athm_InternetContentProviderBusinessMember
                                   
Minimum years track record in principal business                           2 years                                      
Minimum transition period                           2 years                                      
Maximum transition period                           3 years                                      
Concentration percentage                               69.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= athm_VariableInterestEntityStructureConcentrationRiskMember
100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= athm_VariableInterestEntityStructureConcentrationRiskMember
99.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= athm_VariableInterestEntityStructureConcentrationRiskMember
37.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AssetsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= athm_VariableInterestEntityStructureConcentrationRiskMember
62.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AssetsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= athm_VariableInterestEntityStructureConcentrationRiskMember
15.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LiabilitiesTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= athm_VariableInterestEntityStructureConcentrationRiskMember
40.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LiabilitiesTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= athm_VariableInterestEntityStructureConcentrationRiskMember
                     
Amounts due from PRC subsidiaries                                             45,266,000us-gaap_DueFromAffiliateCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
280,857,000us-gaap_DueFromAffiliateCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
883,000us-gaap_DueFromAffiliateCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
               
Inter-company balances between VIE and WFOE and Autohome HK                                             $ 44,253,000athm_AmountPayableByViesAndViesSubsidiariesToWofesRelatedToServiceFees
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
274,569,000athm_AmountPayableByViesAndViesSubsidiariesToWofesRelatedToServiceFees
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
20,323,000athm_AmountPayableByViesAndViesSubsidiariesToWofesRelatedToServiceFees
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember