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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Detail) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2012 Ordinary Shares, Class A Ordinary Shares and Class B Ordinary Shares [Member] CNY | Dec. 31, 2014 Class A Ordinary Shares [Member] USD ($) | Dec. 31, 2014 Class A Ordinary Shares [Member] CNY | Dec. 31, 2013 Class A Ordinary Shares [Member] CNY | Dec. 31, 2012 Class A Ordinary Shares [Member] | Dec. 31, 2014 Class B Ordinary Shares [Member] USD ($) | Dec. 31, 2014 Class B Ordinary Shares [Member] CNY | Dec. 31, 2013 Class B Ordinary Shares [Member] CNY | Dec. 31, 2012 Class B Ordinary Shares [Member]
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 120,665 us-gaap_NetIncomeLoss | 748,680 us-gaap_NetIncomeLoss | 456,162 us-gaap_NetIncomeLoss | 212,881 us-gaap_NetIncomeLoss | 212,881 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 43,675 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 270,988 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 142,053 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ 76,990 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 477,692 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 314,109 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 100,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 100,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 38,633,284 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 38,633,284 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 31,109,214 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 68,102,019 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,102,019 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,788,940 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Basic earnings per share | $ 1.13 us-gaap_EarningsPerShareBasic | 7.01 us-gaap_EarningsPerShareBasic | 4.57 us-gaap_EarningsPerShareBasic | 2.13 us-gaap_EarningsPerShareBasic | 2.13 us-gaap_EarningsPerShareBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1.13 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 7.01 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 4.57 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ 1.13 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 7.01 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4.57 us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 212,881 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 47,835 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 296,797 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 155,394 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 72,830 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 451,883 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 300,768 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Reallocation of net income as a result of conversion of Class B into Class A ordinary shares (Note 13) |  |  |  |  | 0 us-gaap_UndistributedEarningsDiluted / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 72,830 us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 451,883 us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 300,768 us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 0 us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Net income |  |  |  |  | 212,881 us-gaap_NetIncomeLossAttributableToParentDiluted / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 120,665 us-gaap_NetIncomeLossAttributableToParentDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 748,680 us-gaap_NetIncomeLossAttributableToParentDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 456,162 us-gaap_NetIncomeLossAttributableToParentDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ 72,830 us-gaap_NetIncomeLossAttributableToParentDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 451,883 us-gaap_NetIncomeLossAttributableToParentDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 300,768 us-gaap_NetIncomeLossAttributableToParentDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 100,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 100,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 38,633,284 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 38,633,284 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 31,109,214 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 68,102,019 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,102,019 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,788,940 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Conversion of Class B into Class A ordinary shares (Note 13) |  |  |  |  | 0 athm_IncrementalCommonSharesAttributableToConversionOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 68,102,019 athm_IncrementalCommonSharesAttributableToConversionOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 68,102,019 athm_IncrementalCommonSharesAttributableToConversionOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 68,788,940 athm_IncrementalCommonSharesAttributableToConversionOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 0 athm_IncrementalCommonSharesAttributableToConversionOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 athm_IncrementalCommonSharesAttributableToConversionOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 athm_IncrementalCommonSharesAttributableToConversionOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Dilutive effect of share-based awards |  |  |  |  | 650,652 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,096,282 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 6,096,282 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 4,431,072 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Weighted-average number of shares outstanding- diluted | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 100,650,652 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 100,650,652 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 112,831,585 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 112,831,585 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 104,329,226 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 68,102,019 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,102,019 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 68,788,940 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Diluted earnings per share | $ 1.07 us-gaap_EarningsPerShareDiluted | 6.64 us-gaap_EarningsPerShareDiluted | 4.37 us-gaap_EarningsPerShareDiluted | 2.12 us-gaap_EarningsPerShareDiluted | 2.12 us-gaap_EarningsPerShareDiluted / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1.07 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 6.64 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 4.37 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ 1.07 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 6.64 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 4.37 us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |

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