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Ordinary Shares - Additional Information (Detail) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended |  |  |  | 1 Months Ended |  |  |  |
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Nov. 04, 2013 | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2013 West Crest Limited [Member] CNY | Dec. 31, 2014 Class A Ordinary Shares [Member] | Dec. 31, 2013 Class A Ordinary Shares [Member] | Dec. 31, 2012 Class A Ordinary Shares [Member] | Dec. 31, 2014 Class A Ordinary Shares [Member] Prior to the Completion of the IPO on December 11, 2013 [Member] | Dec. 31, 2014 Class A Ordinary Shares [Member] IPO [Member] | Dec. 31, 2014 Class B Ordinary Shares [Member] | Dec. 31, 2013 Class B Ordinary Shares [Member] | Dec. 31, 2014 Class B Ordinary Shares [Member] Prior to the Completion of the IPO on December 11, 2013 [Member] | Dec. 31, 2013 American Depositary Shares [Member] IPO [Member] USD ($) | Nov. 30, 2014 American Depositary Shares [Member] Follow-on offering [Member] USD ($) | Dec. 31, 2014 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] | Dec. 31, 2014 Telstra Holdings Pty Ltd. [Member] Minimum [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares repurchased and treasury stock | 3,856,564 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payable for repurchase of common stock |  | $ 0 athm_PayableForRepurchaseOfCommonStocks | 0 athm_PayableForRepurchaseOfCommonStocks | 227,015 athm_PayableForRepurchaseOfCommonStocks | 0 athm_PayableForRepurchaseOfCommonStocks | 227,015 athm_PayableForRepurchaseOfCommonStocks / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = athm_WestCrestLimitedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 39.30%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = athm_TelstraHoldingsProprietaryLimitedMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Number of 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 |  | 27,354,496 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_SubsidiarySaleOfStockAxis = athm_PriorToIpoMember |  | 61,824,328 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,788,940 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,788,940 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_SubsidiarySaleOfStockAxis = athm_PriorToIpoMember |  |  |  |  |  |  |
Newly issued shares through offering |  |  |  |  |  |  |  |  |  |  | 8,993,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  | 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 |  |  |  |  |
Proceeds from issuance of common stock |  | $ 97,344 us-gaap_ProceedsFromIssuanceOfCommonStock | 603,980 us-gaap_ProceedsFromIssuanceOfCommonStock | 863,200 us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |  |  |  | $ 142,590 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = athm_AmericanDepositarySharesMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember | $ 97,344 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 |  |  |  |  |  |  |  |  |  |  |  |

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