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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 |  |  |  |  |  |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,828,147 us-gaap_StockRepurchasedDuringPeriodShares / dei_LegalEntityAxis = athm_TelstraHoldingsProprietaryLimitedMember |  |  |  |  |  |
Ordinary shares purchased, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,000,000 us-gaap_StockRepurchasedDuringPeriodValue / dei_LegalEntityAxis = athm_TelstraHoldingsProprietaryLimitedMember |  |  |  |  |  |
Ordinary shares repurchased and retired | 3,856,564 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares repurchased and retired, value | 75,000,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  | 457,350,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments to be paid in cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 athm_NumberOfInstallment / dei_LegalEntityAxis = athm_WestCrestLimitedMember
Newly issued shares through offering |  |  |  |  |  | 8,993,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = athm_AmericanDepositarySharesMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember | 2,424,801 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = athm_AmericanDepositarySharesMember / us-gaap_SubsidiarySaleOfStockAxis = athm_FollowOnOfferingMember |  |  |  | 8,993,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares |  | 97,344,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 603,980,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 863,200,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock | 142,590,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = athm_AmericanDepositarySharesMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember | 97,344,000 us-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 |  |  |  |  |  |  |  | 6,964,612 athm_SharesConvertedIntoClassaOrdinarySharesFromClassbOrdinarySharesDuringThePeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 0 athm_SharesConvertedIntoClassaOrdinarySharesFromClassbOrdinarySharesDuringThePeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 0 athm_SharesConvertedIntoClassaOrdinarySharesFromClassbOrdinarySharesDuringThePeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares outstanding |  |  |  |  |  |  |  | 48,777,835 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 36,347,496 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  | 61,824,328 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,788,940 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,266,000 us-gaap_DueFromAffiliateCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 280,857,000 us-gaap_DueFromAffiliateCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 883,000 us-gaap_DueFromAffiliateCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |  |
Inter-company balances between VIE and WFOE and Autohome HK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,253,000 athm_AmountPayableByViesAndViesSubsidiariesToWofesRelatedToServiceFees / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 274,569,000 athm_AmountPayableByViesAndViesSubsidiariesToWofesRelatedToServiceFees / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 20,323,000 athm_AmountPayableByViesAndViesSubsidiariesToWofesRelatedToServiceFees / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |  |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Details
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