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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
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 3,856,564us-gaap_StockRepurchasedAndRetiredDuringPeriodShares                                        
Payable for repurchase of common stock   $ 0athm_PayableForRepurchaseOfCommonStocks 0athm_PayableForRepurchaseOfCommonStocks 227,015athm_PayableForRepurchaseOfCommonStocks 0athm_PayableForRepurchaseOfCommonStocks 227,015athm_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             48,777,835us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 36,347,496us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   27,354,496us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= athm_PriorToIpoMember		   61,824,328us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 68,788,940us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 68,788,940us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_SubsidiarySaleOfStockAxis
= athm_PriorToIpoMember		              
Newly issued shares through offering                     8,993,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		       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		          
Proceeds from issuance of common stock   $ 97,344us-gaap_ProceedsFromIssuanceOfCommonStock 603,980us-gaap_ProceedsFromIssuanceOfCommonStock 863,200us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock                   $ 142,590us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= athm_AmericanDepositarySharesMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		 $ 97,344us-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