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Share-Based Compensation - Additional Information (Detail) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  |  |  | 12 Months Ended
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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 |  |  |  |  |  |  | 7,843,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_AwardDateAxis = athm_MayFourthTwoThousandElevenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 3,350,000 us-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 | 4,868,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 4,868,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 7,665,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 5,663,237 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |  |  |  |  |
Ordinary shares available for future grant |  |  |  |  | 2,488,937 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |  |  |  |  |
Closing stock price | $ 36.62 us-gaap_SharePrice |  |  | $ 3.70 us-gaap_SharePrice | $ 36.36 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 11.64 us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Aggregate intrinsic value of options exercised | $ 111,833 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 693,878 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value of outstanding options at the grant date | 18,376 athm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateFairValue | 114,013 athm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateFairValue |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | 7,742 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | 48,033 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |  |  |  |  | 19,667 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 122,026 us-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 |  |  |  |  |  |  |  |  | $ 22,157 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 137,477 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Weighted average grant date fair value, Granted |  |  |  |  |  |  |  |  | $ 37.30 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  | $ 12.38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = athm_NovemberFourthTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Definition Share based compensation arrangement by share based payment award options outstanding aggregate fair value. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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