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Taxation - Additional Information (Detail) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 USD ($) | Sep. 30, 2014 CNY | Sep. 30, 2013 CNY | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2012 USD ($) | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Cayman Islands [Member] | Dec. 31, 2013 British Virgin Islands [Member] Cheerbright International Holdings, Ltd [Member] | Dec. 31, 2013 China [Member] USD ($) | Dec. 31, 2013 China [Member] CNY | Dec. 31, 2013 China [Member] Autohome WFOE [Member] | Dec. 31, 2007 China [Member] Autohome WFOE [Member] | Dec. 31, 2013 China [Member] VIEs [Member] | Dec. 31, 2012 China [Member] VIEs [Member] | Dec. 31, 2011 China [Member] VIEs [Member] | Dec. 31, 2013 China [Member] High-New Technology Enterprise [Member] Autohome WFOE [Member] | Mar. 16, 2012 Hong Kong [Member] | Oct. 18, 2013 Hong Kong [Member] Subsidiaries [Member] | Dec. 31, 2013 Hong Kong [Member] Subsidiaries [Member] USD ($) | Dec. 31, 2012 Hong Kong [Member] Subsidiaries [Member] USD ($) | Dec. 31, 2011 Hong Kong [Member] Subsidiaries [Member] USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 25.00% | 25.00% | 25.00% | 33.00% | 25.00% | 25.00% | 25.00% |  | 16.50% | 16.50% |  |  |
Income tax expense | $ 21,041 | 129,150 | 82,940 | $ 18,550 | 112,294 | 90,988 | 38,348 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Preferential statutory tax rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |
Preferential income tax rate period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Non-PRC resident withholding tax on dividends paid, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |
Net tax operating losses |  |  |  |  |  |  |  |  |  |  |  |  | 1,695 | 10,262 |  |  |  |  |  |  |  |  |  |  |
Net tax operating losses expiration year |  |  |  |  |  |  |  |  |  |  |  |  | 2017 | 2017 |  |  |  |  |  |  |  |  |  |  |
Accrued deferred income tax liabilities |  |  |  |  |  | 26,629 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  | 4,866 | 29,459 | 17,379 | 5,971 | 2,871 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized liabilities related to unrecognized tax benefits | 4,731 | 29,041 |  | 4,797 | 29,041 | 16,568 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  |  | 1,744 | 10,560 | 3,790 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense relating to unrecognized tax benefits |  |  |  | 349 | 2,115 | 685 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalties related to continuing operations |  |  |  | $ 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax year that remains open to examination under enacted tax laws |  |  |  |  |  |  |  |  | 2008 | 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate | 20.56% | 20.56% | 19.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The preferential income tax rate that High and New Technology Enterprises can enjoy for three years but need to re-apply after the end of the three-year period under the current PRC Corporate Income Tax Law. + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31958-109318 + Details
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