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Organization, Basis of Presentation and Use of Estimates - Schedule of Subsidiaries of Company (Detail) (Subsidiaries [Member]) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013
Cheerbright International Holdings, Ltd [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Jun. 13, 2006 | Jun. 13, 2006
Place of incorporation | British Virgin Islands | British Virgin Islands
Principal activities | Investment holding | Investment holding
Percentage of direct ownership by the Company | 100.00% | 100.00%
Autohome (Hong Kong) Ltd. [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Mar. 16, 2012 | Mar. 16, 2012
Place of incorporation | Hong Kong | Hong Kong
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company | 100.00% | 100.00%
Autohome Media Limited [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Oct. 18, 2013 | Oct. 18, 2013
Place of incorporation | Hong Kong | Hong Kong
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company | 100.00% | 100.00%
Beijing Cheerbright Technology Co., Ltd. [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Sep. 01, 2006 | Sep. 01, 2006
Place of incorporation | PRC | PRC
Principal activities | Provision of technical and consulting services | Provision of technical and consulting services
Percentage of direct ownership by the Company | 100.00% | 100.00%
Autohome Shanghai Advertising Co., Ltd. [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Sep. 29, 2013 | Sep. 29, 2013
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company | 100.00% | 100.00%
Beijing Prbrownies Software Co., Ltd.( formerly known as Beijing Autohome Software Co., Ltd.) [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Nov. 12, 2013 | Nov. 12, 2013
Place of incorporation | PRC | PRC
Principal activities | Provision of information technology services | Provision of information technology services
Percentage of direct ownership by the Company | 100.00% | 100.00%
Beijing Autohome Technologies Co., Ltd. [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Nov. 12, 2013 | Nov. 12, 2013
Place of incorporation | PRC | PRC
Principal activities | Provision of information technology services | Provision of information technology services
Percentage of direct ownership by the Company | 100.00% | 100.00%
Beijing Autohome Advertising Co., Ltd. [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Nov. 13, 2013 | Nov. 13, 2013
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company | 100.00% | 100.00%
Guangzhou Autohome Advertising Co., Ltd. [Member] |  |
Organization [Line Items] |  |
Date of incorporation or acquisition | Nov. 25, 2013 | Nov. 25, 2013
Place of incorporation | PRC | PRC
Principal activities | Provision of online advertising services | Provision of online advertising services
Percentage of direct ownership by the Company | 100.00% | 100.00%

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