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

X

- Definition

Represents the amount of deferred tax liability provided on the outside basis difference for the remaining undistributed earnings.

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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.

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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.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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.

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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).

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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.

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