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Related Party Transactions - Additional Information (Detail) In Thousands, unless otherwise specified |  |  | 12 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 9 Months Ended | 12 Months Ended |
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Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2012 Beijing Shengtuo Autohome Advertising Co., Ltd. [Member] CNY | Apr. 30, 2012 Beijing POP Information Technology Co., Ltd. [Member] CNY | Apr. 30, 2012 Lianhe Shangqing (Beijing) Advertisement Co., Ltd. [Member] CNY | Sep. 30, 2013 Telstra International HK Limited [Member] CNY | Dec. 31, 2013 Telstra International HK Limited [Member] USD ($) | Dec. 31, 2013 Telstra International HK Limited [Member] CNY | Dec. 31, 2012 Telstra International HK Limited [Member] CNY | Sep. 30, 2014 Telstra International Limited [Member] USD ($) | Sep. 30, 2014 Telstra International Limited [Member] CNY | Sep. 30, 2013 Telstra International Limited [Member] CNY | Dec. 31, 2013 Telstra International Limited [Member] USD ($) | Dec. 31, 2013 Telstra International Limited [Member] CNY | Dec. 31, 2012 Telstra International Limited [Member] CNY | Dec. 31, 2013 Autohome Media Limited [Member] CNY | Oct. 31, 2013 Autohome Media Limited [Member] | Sep. 30, 2014 Beijing Australian Telecommunications Technical Consulting Limited [Member] USD ($) | Sep. 30, 2014 Beijing Australian Telecommunications Technical Consulting Limited [Member] CNY | Dec. 31, 2013 Beijing Australian Telecommunications Technical Consulting Limited [Member] USD ($) | Dec. 31, 2013 Beijing Australian Telecommunications Technical Consulting Limited [Member] CNY | Dec. 31, 2012 Beijing Australian Telecommunications Technical Consulting Limited [Member] CNY
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office rent expense |  |  |  | 438 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of outstanding related party balances |  |  |  |  | 2,085 | 3,008 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Network maintenance services |  |  |  |  |  |  | 128 | 21 | 128 | 246 | 47 | 288 | 160 | 42 | 255 |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013-10 |  |  |  |  |  |
The percentage of Autohome Media owned by the spouse of one of the Group's directors, prior to the acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Related party payables outstanding | 94 | 567 |  |  |  |  |  |  |  |  |  |  |  | 69 | 418 |  |  |  |  |  | 25 | 149 |
Executive services on a part-time basis |  |  |  |  |  |  |  |  |  |  | $ 43 | 266 |  | $ 69 | 418 |  |  |  | $ 36 | 218 | $ 25 | 149 |

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