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Share-Based Compensation - Summary of Restricted Stock Option Granted (Parenthetical) (Detail) (Restricted Shares [Member]) | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Nov. 04, 2013 | Dec. 31, 2014 | May 08, 2014 | Oct. 09, 2014
November 4, 2013 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 25% of the awards have vested on September 29, 2014 and the remainder of the awards will vest on an annual basis each September 29, thereafter, until September 29, 2017. |  |
Percentage of awards vesting | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardDateAxis = athm_NovemberFourthTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
May 8, 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 4 years |
Award vesting period |  | The restricted shares granted on May 8, 2014 will vest over a period of approximately four years, with 25% of the awards vesting on various dates ranging from March 14, 2015 to May 13, 2015, and the remainder of the awards vesting on an annual basis thereafter, until 2018. |  |
Percentage of awards vesting |  |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardDateAxis = athm_MayEightTwoThousandAndFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
October 9, 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  |  | 4 years
Award vesting period |  | The restricted shares granted on October 9, 2014 will vest over a period of approximately four years, with 25% of the awards vesting on various dates ranging from January 1, 2015 to October 1, 2015, and the remainder of the awards vesting on an annual basis thereafter, until 2018. |  |
Percentage of awards vesting |  |  |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardDateAxis = athm_OctoberNineTwoThousandAndFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
December 9, 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | The restricted shares granted on December 9, 2014 fully vested on the grant date. |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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