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Share-Based Compensation - Summary of Restricted Stock Option Granted (Detail) (Restricted Shares [Member], USD $) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Awards, Granted | 507,063 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Fair Value per Share at the Grant date | $ 37.30 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
November 4, 2013 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Grant date | 2013-11-04
Number of Awards, Granted | 400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = athm_NovemberFourthTwoThousandThirteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Fair Value per Share at the Grant date | $ 12.38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / 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] |
Grant date | 2014-05-08
Number of Awards, Granted | 100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = athm_MayEightTwoThousandAndFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Fair Value per Share at the Grant date | $ 29.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / 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] |
Grant date | 2014-10-09
Number of Awards, Granted | 406,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = athm_OctoberNineTwoThousandAndFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Fair Value per Share at the Grant date | $ 39.35 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / 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] |
Grant date | 2014-12-09
Number of Awards, Granted | 1,063 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = athm_DecemberNineTwoThousandAndFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Fair Value per Share at the Grant date | $ 36.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = athm_DecemberNineTwoThousandAndFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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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 The number of grants made 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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