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Share-Based Compensation - Summary of Stock Options Granted to Employees and Directors (Detail) (USD $)	12 Months Ended	0 Months Ended
	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	$ 2.20us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Number of Awards, Granted	177,600us-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		$ 2.20us-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		120,000us-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			$ 2.20us-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			560,000us-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				$ 2.20us-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				150,000us-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				$ 2.20us-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				78,000us-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					$ 2.20us-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					57,600us-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					$ 2.20us-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					120,000us-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.

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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

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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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.

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