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Organization, Basis of Presentation and Use of Estimates - Schedule of VIEs (Detail) (Consolidated VIEs [Member]) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Beijing Autohome Information Technology Co., Ltd. [Member] |  |
Variable Interest Entity [Line Items] |  |
Date of incorporation or acquisition | Aug. 28, 2006 | Aug. 28, 2006
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising and dealer subscription services | Provision of online advertising and dealer subscription services
Percentage of direct ownership by the Company |  |
Beijing Shengtuo Autohome Advertising Co., Ltd. [Member] |  |
Variable Interest Entity [Line Items] |  |
Date of incorporation or acquisition | Sep. 21, 2010 | Sep. 21, 2010
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company |  |
Beijing Shengtuo Hongyuan Information Technology Co., Ltd. [Member] |  |
Variable Interest Entity [Line Items] |  |
Date of incorporation or acquisition | Nov. 08, 2010 | Nov. 08, 2010
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising and dealer subscription services | Provision of online advertising and dealer subscription services
Percentage of direct ownership by the Company |  |
Beijing Shengtuo Chengshi Advertising Co., Ltd. [Member] |  |
Variable Interest Entity [Line Items] |  |
Date of incorporation or acquisition | Nov. 12, 2010 | Nov. 12, 2010
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company |  |
Shanghai Youche Youjia Advertising Co., Ltd. [Member] |  |
Variable Interest Entity [Line Items] |  |
Date of incorporation or acquisition | Dec. 31, 2011 | Dec. 31, 2011
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company |  |
Guangzhou Youche Youjia Advertising Co., Ltd. [Member] |  |
Variable Interest Entity [Line Items] |  |
Date of incorporation or acquisition | May 08, 2012 | May 08, 2012
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company |  |

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