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Share-Based Compensation - Additional Information (Detail)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
Dec. 31, 2012
USD ($)
Dec. 31, 2014
Class A Ordinary Shares [Member]
USD ($)
Dec. 31, 2013
Maximum [Member]
USD ($)
Dec. 31, 2014
Employee Stock Option [Member]
May 4, 2011 [Member]
Maximum [Member]
Dec. 31, 2014
Employee Stock Option [Member]
November 4, 2013 [Member]
Maximum [Member]
Dec. 31, 2014
Restricted Shares [Member]
USD ($)
Dec. 31, 2014
Restricted Shares [Member]
CNY
Dec. 31, 2014
Restricted Shares [Member]
Scenario, Previously Reported [Member]
USD ($)
Dec. 31, 2014
Restricted Shares [Member]
Scenario, Previously Reported [Member]
CNY
Dec. 31, 2014
Restricted Shares [Member]
November 4, 2013 [Member]
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Share based awards grant to employees, directors and consultants to purchase aggregate ordinary shares             7,843,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardDateAxis
= athm_MayFourthTwoThousandElevenMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 3,350,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardDateAxis
= athm_NovemberFourthTwoThousandThirteenMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		          
Share-based awards, ordinary shares outstanding 4,868,237us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 4,868,237us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 7,665,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   5,663,237us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                
Ordinary shares available for future grant         2,488,937us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                
Closing stock price $ 36.62us-gaap_SharePrice     $ 3.70us-gaap_SharePrice $ 36.36us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 11.64us-gaap_SharePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
Aggregate intrinsic value of options exercised $ 111,833us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 693,878us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue                      
Aggregate fair value of outstanding options at the grant date 18,376athm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateFairValue 114,013athm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateFairValue                      
Unrecognized compensation expense 7,742us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized 48,033us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized                 19,667us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 122,026us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		  
Unvested options/restricted shares expected to be recognized over a weighted-average period 2 years 3 months 26 days 2 years 3 months 26 days                 3 years 1 month 24 days 3 years 1 month 24 days  
Aggregate fair value of restricted shares                 $ 22,157us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 137,477us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		      
Weighted average grant date fair value, Granted                 $ 37.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		       $ 12.38us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardDateAxis
= athm_NovemberFourthTwoThousandThirteenMember
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember