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Taxation - Additional Information (Detail) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2014 Minimum [Member] | Dec. 31, 2014 Maximum [Member] | Dec. 31, 2014 Cayman Islands [Member] | Dec. 31, 2014 British Virgin Islands [Member] Cheerbright International Holdings, Ltd [Member] | Mar. 16, 2012 Hong Kong [Member] | Oct. 31, 2013 Hong Kong [Member] Subsidiaries [Member] | Dec. 31, 2014 Hong Kong [Member] Subsidiaries [Member] USD ($) | Dec. 31, 2013 Hong Kong [Member] Subsidiaries [Member] USD ($) | Dec. 31, 2012 Hong Kong [Member] Subsidiaries [Member] USD ($) | Dec. 31, 2014 China [Member] USD ($) | Dec. 31, 2014 China [Member] CNY | Dec. 31, 2014 China [Member] Autohome WFOE [Member] High-New Technology Enterprise [Member] | Dec. 31, 2014 China [Member] VIEs [Member] | Dec. 31, 2013 China [Member] VIEs [Member] | Dec. 31, 2012 China [Member] VIEs [Member]
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  |  |  |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_KY | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = athm_CheerbrightInternationalHoldingsLimitedMember / us-gaap_StatementGeographicalAxis = country_VG | 16.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_HK | 16.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_HK / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember |  |  |  | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_CN | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_CN |  | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementGeographicalAxis = country_CN / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember
Income tax expense | $ 31,071 us-gaap_IncomeTaxExpenseBenefit | 192,781 us-gaap_IncomeTaxExpenseBenefit | 112,294 us-gaap_IncomeTaxExpenseBenefit | 90,988 us-gaap_IncomeTaxExpenseBenefit |  |  |  |  |  |  | $ 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_HK / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember | $ 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_HK / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember | $ 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_HK / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |
Preferential statutory tax rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%athm_PreferentialCorporateIncomeTaxRate / dei_LegalEntityAxis = athm_AutohomeWhollyForeignOwnedEnterpriseMember / us-gaap_ProductOrServiceAxis = athm_HighAndNewTechnologyEnterprisesMember / us-gaap_StatementGeographicalAxis = country_CN |  |  |
Preferential income tax rate period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Effect of preferential tax rate | 14,408 athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRate | 89,394 athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRate | 49,551 athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRate | 34,007 athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of preferential tax rate, basic earning per ADS | $ 0.14 athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRateBasicEarningPerAmericanDepositoryShares | 0.84 athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRateBasicEarningPerAmericanDepositoryShares | 0.50 athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRateBasicEarningPerAmericanDepositoryShares | 0.34 athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRateBasicEarningPerAmericanDepositoryShares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-PRC resident withholding tax on dividends paid, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%athm_WithholdingIncomeTaxRateOnDividendsPaid / us-gaap_StatementGeographicalAxis = country_CN | 10.00%athm_WithholdingIncomeTaxRateOnDividendsPaid / us-gaap_StatementGeographicalAxis = country_CN |  |  |  |
Net tax operating losses |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,468 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_CN | 33,927 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_CN |  |  |  |
Net tax operating losses expiration year |  |  |  |  |  |  |  |  |  |  |  |  |  | 2017 | 2017 |  |  |  |
Undistributed earnings from PRC Subsidiaries | 203,925 us-gaap_UndistributedEarningsOfForeignSubsidiaries | 1,265,273 us-gaap_UndistributedEarningsOfForeignSubsidiaries | 570,864 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits | 3,877 athm_LiabilityForUncertainTaxPositionsNoncurrentBeforeNetPresentAgainstDeferredTaxAsset | 24,058 athm_LiabilityForUncertainTaxPositionsNoncurrentBeforeNetPresentAgainstDeferredTaxAsset | 29,459 athm_LiabilityForUncertainTaxPositionsNoncurrentBeforeNetPresentAgainstDeferredTaxAsset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized liabilities related to unrecognized tax benefits |  |  | 418 athm_UnrecognizedTaxBenefitResultingInNetOperatingLossCarryforward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | 2,453 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 15,222 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 10,560 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense relating to unrecognized tax benefits | 642 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 3,984 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 2,115 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 685 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalties related to continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense relating to tax expense | 1,093 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 6,784 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 2,800 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalties relating to tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax year that remains open to examination under enacted tax laws |  |  |  |  | 2009 | 2014 |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition The portion of the difference, between total income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the unified statutory income tax rates to pretax income from continuing operations, that is attributable to total domestic income tax expense (benefit). The domestic income tax expense (benefit) difference represents the income tax expense (benefit) at applicable unified statutory income tax rates applied to domestic earnings (loss) for the period versus the domestic income tax expense (benefit) calculated by applying the appropriate tax rates, as Autohome WFOE has been recognized as a "High-New Technology Enterprises", and is eligible for a 15% preferential tax rate. + References No definition available. + Details
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- Definition Per basic ordinary share amount effect of the income tax benefit resulting from the preferential tax rate granted by taxing jurisdictions. + References No definition available. + Details
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- Definition The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date before net present against deferred tax assets related to tax loss carry forwards. + References No definition available. + Details
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- Definition The preferential income tax rate that High and New Technology Enterprises can enjoy for three years but need to re-apply after the end of the three-year period under the current PRC Corporate Income Tax Law. + References No definition available. + Details
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- Definition Represents the withholding income tax on dividends, imposed under the income law, on dividends distributed by foreign-invested enterprises (FIEs) to its immediate holding company outside of China, if such immediate holding company is considered as a non-resident enterprise + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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