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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Detail)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
¥ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
CNY (¥)
¥ / shares
shares
Dec. 31, 2014
CNY (¥)
¥ / shares
shares
Numerator:        
Net income attributable to Autohome Inc. ¥ 1,227,914 $ 176,857 ¥ 990,649 ¥ 748,680
Denominator:        
Weighted average ordinary shares outstanding 114,237,600 114,237,600    
Basic earnings per share | (per share) ¥ 10.75 $ 1.55 ¥ 8.83 ¥ 7.01
Numerator:        
Net income attributable to Autohome Inc. ¥ 1,227,914 $ 176,857    
Reallocation of net income as a result of conversion of Class B into Class A ordinary shares (Note 16) 0 0    
Net income attributable to Autohome Inc. ¥ 1,227,914 $ 176,857    
Denominator:        
Weighted average ordinary shares outstanding 114,237,600 114,237,600    
Conversion of Class B into Class A ordinary shares (Note 16) 0 0    
Dilutive effect of share-based awards 1,798,727 1,798,727    
Weighted-average number of shares outstanding- diluted 116,036,327 116,036,327    
Diluted earnings per share | (per share) ¥ 10.58 $ 1.52 ¥ 8.57 ¥ 6.64
Class A Ordinary Shares [Member]        
Numerator:        
Net income attributable to Autohome Inc. | ¥     ¥ 444,916 ¥ 270,988
Denominator:        
Weighted average ordinary shares outstanding     50,403,077 38,633,284
Basic earnings per share | ¥ / shares     ¥ 8.83 ¥ 7.01
Numerator:        
Net income attributable to Autohome Inc. | ¥     ¥ 461,052 ¥ 296,797
Reallocation of net income as a result of conversion of Class B into Class A ordinary shares (Note 16) | ¥     529,597 451,883
Net income attributable to Autohome Inc. | ¥     ¥ 990,649 ¥ 748,680
Denominator:        
Weighted average ordinary shares outstanding     50,403,077 38,633,284
Conversion of Class B into Class A ordinary shares (Note 16)     61,824,328 68,102,019
Dilutive effect of share-based awards     3,419,421 6,096,282
Weighted-average number of shares outstanding- diluted     115,646,826 112,831,585
Diluted earnings per share | ¥ / shares     ¥ 8.57 ¥ 6.64
Class B Ordinary Shares [Member]        
Numerator:        
Net income attributable to Autohome Inc. | ¥     ¥ 545,733 ¥ 477,692
Denominator:        
Weighted average ordinary shares outstanding     61,824,328 68,102,019
Basic earnings per share | ¥ / shares     ¥ 8.83 ¥ 7.01
Numerator:        
Net income attributable to Autohome Inc. | ¥     ¥ 529,597 ¥ 451,883
Reallocation of net income as a result of conversion of Class B into Class A ordinary shares (Note 16) | ¥     0 0
Net income attributable to Autohome Inc. | ¥     ¥ 529,597 ¥ 451,883
Denominator:        
Weighted average ordinary shares outstanding     61,824,328 68,102,019
Conversion of Class B into Class A ordinary shares (Note 16)     0 0
Dilutive effect of share-based awards     0 0
Weighted-average number of shares outstanding- diluted     61,824,328 68,102,019
Diluted earnings per share | ¥ / shares     ¥ 8.57 ¥ 6.64