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Share-Based Compensation - Summary of Stock Options Granted to Employees and Directors (Detail) (USD $) | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Jul. 01, 2012 | May 27, 2013 | Oct. 22, 2013 | Jan. 16, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise Price | $ 2.20 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |  |  |  |
Number of Awards, Granted | 177,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  |  |  |
Directors and Employees [Member] | 2011 Plan [Member] | Employee Stock Option [Member] | July 1, 2012 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date | 2012-07-01 |  |  |  |
Contractual Terms |  | 10 years |  |  |
Exercise Price |  | $ 2.20 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = athm_JulyFirstTwoThousandTwelveMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember |  |  |
Number of Awards, Granted |  | 120,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardDateAxis = athm_JulyFirstTwoThousandTwelveMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember |  |  |
Directors and Employees [Member] | 2011 Plan [Member] | Employee Stock Option [Member] | May 27, 2013 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date | 2013-05-27 |  |  |  |
Contractual Terms |  |  | 10 years |  |
Exercise Price |  |  | $ 2.20 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = athm_MayTwentySevenTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember |  |
Number of Awards, Granted |  |  | 560,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardDateAxis = athm_MayTwentySevenTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember |  |
Directors and Employees [Member] | 2011 Plan [Member] | Options Grant October Date Two [Member] | Employee Stock Option [Member] | October 22, 2013 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date | 2013-10-22 |  |  |  |
Contractual Terms |  |  |  | 10 years |
Exercise Price |  |  |  | $ 2.20 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = athm_OctoberTwentySecondTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember / us-gaap_VestingAxis = athm_OptionsGrantOctoberDateTwoMember |
Number of Awards, Granted |  |  |  | 150,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardDateAxis = athm_OctoberTwentySecondTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember / us-gaap_VestingAxis = athm_OptionsGrantOctoberDateTwoMember |
Directors and Employees [Member] | 2011 Plan [Member] | Options Grant October Date One [Member] | Employee Stock Option [Member] | October 22, 2013 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date | 2013-10-22 |  |  |  |
Contractual Terms |  |  |  | 10 years |
Exercise Price |  |  |  | $ 2.20 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = athm_OctoberTwentySecondTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember / us-gaap_VestingAxis = athm_OptionsGrantOctoberDateOneMember |
Number of Awards, Granted |  |  |  | 78,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardDateAxis = athm_OctoberTwentySecondTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember / us-gaap_VestingAxis = athm_OptionsGrantOctoberDateOneMember |
Directors and Employees [Member] | 2011 Plan [Member] | Options Grant January Date One [Member] | Employee Stock Option [Member] | January 16, 2014 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date | 2014-01-16 |  |  |  |
Contractual Terms |  |  |  |  | 10 years
Exercise Price |  |  |  |  | $ 2.20 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = athm_JanuarySixteenTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember / us-gaap_VestingAxis = athm_OptionsGrantJanuaryDateOneMember
Number of Awards, Granted |  |  |  |  | 57,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardDateAxis = athm_JanuarySixteenTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember / us-gaap_VestingAxis = athm_OptionsGrantJanuaryDateOneMember
Directors and Employees [Member] | 2011 Plan [Member] | Options Grant January Date Two [Member] | Employee Stock Option [Member] | January 16, 2014 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date | 2014-01-16 |  |  |  |
Contractual Terms |  |  |  |  | 10 years
Exercise Price |  |  |  |  | $ 2.20 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardDateAxis = athm_JanuarySixteenTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember / us-gaap_VestingAxis = athm_OptionsGrantJanuaryDateTwoMember
Number of Awards, Granted |  |  |  |  | 120,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardDateAxis = athm_JanuarySixteenTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = athm_TwoThousandAndElevenPlanMember / us-gaap_TitleOfIndividualAxis = athm_DirectorsAndEmployeesMember / us-gaap_VestingAxis = athm_OptionsGrantJanuaryDateTwoMember

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Award Grant Date + References No definition available. + Details
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Namespace Prefix: | athm_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
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- Details
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Namespace Prefix: |
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