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Taxation - Reconciliation of Income Tax Expense (Detail) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY
Income Tax Disclosure [Abstract] |  |  |  |
Income before income tax expense | $ 151,736 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 941,461 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 568,456 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 303,869 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense computed at applicable tax rates (25%) | 37,935 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 235,365 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 142,114 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 75,967 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Non-deductible expenses | 1,345 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 8,344 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 697 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 14,571 us-gaap_IncomeTaxReconciliationNondeductibleExpense
Valuation allowances | 885 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 5,493 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 2,114 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Outside basis difference | 4,479 athm_DeferredTaxLiabilityProvidedOnOutsideBasisDifferenceForRemainingUndistributedEarnings | 27,789 athm_DeferredTaxLiabilityProvidedOnOutsideBasisDifferenceForRemainingUndistributedEarnings | 14,254 athm_DeferredTaxLiabilityProvidedOnOutsideBasisDifferenceForRemainingUndistributedEarnings | 30,278 athm_DeferredTaxLiabilityProvidedOnOutsideBasisDifferenceForRemainingUndistributedEarnings
Effect of international tax rate difference | 193 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 1,200 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 551 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 3,494 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Interest expense relating to unrecognized tax benefits | 642 us-gaap_IncomeTaxReconciliationTaxContingencies | 3,984 us-gaap_IncomeTaxReconciliationTaxContingencies | 2,115 us-gaap_IncomeTaxReconciliationTaxContingencies | 685 us-gaap_IncomeTaxReconciliationTaxContingencies
Effect of preferential tax rate | (14,408)athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRate | (89,394)athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRate | (49,551)athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRate | (34,007)athm_IncomeTaxReconciliationTaxProvisionBenefitFromPreferentialTaxRate
Income tax expense | $ 31,071 us-gaap_IncomeTaxExpenseBenefit | 192,781 us-gaap_IncomeTaxExpenseBenefit | 112,294 us-gaap_IncomeTaxExpenseBenefit | 90,988 us-gaap_IncomeTaxExpenseBenefit

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- Definition Represents the amount of deferred tax liability provided on the outside basis difference for the remaining undistributed earnings. + References No definition available. + Details
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- 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 This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + 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 the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + 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 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + 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 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + 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 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + 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 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + 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 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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