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Organization - Schedule of VIEs (Detail) - Consolidated VIEs [Member]	12 Months Ended
	Dec. 31, 2021
Beijing Autohome Information Technology Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Aug. 28, 2006
Place of incorporation	PRC
Beijing Shengtuo Hongyuan Information Technology Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Nov. 08, 2010
Place of incorporation	PRC
Shanghai Tianhe Insurance Brokerage Co., Ltd. [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Sep. 21, 2017
Place of incorporation	PRC
Shanghai Jinwu Auto Technology Consultant Co Ltd [Member]
Variable Interest Entity [Line Items]
Date of incorporation or acquisition	Sep. 20, 2007
Place of incorporation	PRC

X

- Definition

State or Country Name where an entity is incorporated.

+ References

No definition available.

+ Details

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X

- Definition

Date when an entity was incorporated

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

Name:	dei_LegalEntityAxis=athm_BeijingAutohomeInformationTechnologyCompanyLimitedMember
Namespace Prefix:
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X

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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X

- Details

Name:	dei_LegalEntityAxis=athm_BeijingShengtuoHongyuanInformationTechnologyCompanyLimitedMember
Namespace Prefix:
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X

- Details

Name:	dei_LegalEntityAxis=athm_ShanghaiTianheInsuranceBrokerageCoLtdMember
Namespace Prefix:
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X

- Details

Name:	dei_LegalEntityAxis=athm_ShanghaiJinwuAutoTechnologyConsultantCoLtdMember
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