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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
	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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Business acquisition date.

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The percentage of Autohome Media owned by the spouse of one of the Group's directors, prior to the acquisition.

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Maintenance costs incurred and directly related to services rendered by an entity during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(d))

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Section S99

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Amount of transactions with related party during the financial reporting period.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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Expenditures for salaries for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

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