Organization - Schedule of Principal Subsidiaries of Company (Detail)
12 Months Ended
Dec. 31, 2017
Cheerbright International Holdings, Limited [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Jun. 13, 2006
Place of incorporation British Virgin Islands
Percentage of direct ownership by the Company 100.00%
Autohome E-commerce Inc. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Feb. 06, 2015
Place of incorporation Cayman Islands
Percentage of direct ownership by the Company 100.00%
Autohome Link Inc. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Jan. 29, 2015
Place of incorporation Cayman Islands
Percentage of direct ownership by the Company 100.00%
Autohome Financing Limited [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Mar. 23, 2015
Place of incorporation Cayman Islands
Percentage of direct ownership by the Company 100.00%
Autohome (Hong Kong) Limited [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Mar. 16, 2012
Place of incorporation Hong Kong
Percentage of direct ownership by the Company 100.00%
Autohome Media Limited [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Oct. 18, 2013
Place of incorporation Hong Kong
Percentage of direct ownership by the Company 100.00%
Autohome E- Commerce Hong Kong Limited [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Feb. 18, 2015
Place of incorporation Hong Kong
Percentage of direct ownership by the Company 100.00%
Autohome Link Hong Kong Limited [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Feb. 16, 2015
Place of incorporation Hong Kong
Percentage of direct ownership by the Company 100.00%
Autohome Financing Hong Kong Limited [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Apr. 15, 2015
Place of incorporation Hong Kong
Percentage of direct ownership by the Company 100.00%
Beijing Cheerbright Technologies Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Sep. 01, 2006
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Autohome Shanghai Advertising Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Sep. 29, 2013
Place of incorporation PRC
Percentage of direct ownership by the Company 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
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Beijing Autohome Technologies Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Nov. 12, 2013
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Beijing Autohome Advertising Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Nov. 13, 2013
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Guangzhou Autohome Advertising Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Nov. 25, 2013
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Autohome (Tianjin) Automobile Sales Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Oct. 20, 2014
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Beijing Chezhiying Technology Co., Ltd. ("Chezhiying WFOE") [Member]  
Organization [Line Items]  
Date of incorporation or acquisition May 26, 2015
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Beijing Chezhiying Software Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Dec. 09, 2015
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Beijing Kemoshijie Technology Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Sep. 11, 2015
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Beijing Haochezhijia E-commerce Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Apr. 25, 2016
Place of incorporation PRC
Percentage of direct ownership by the Company 75.00%
Huai'an Prbrownies Software Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Sep. 13, 2016
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%
Chengdu Prbrownies Software Co., Ltd. [Member]  
Organization [Line Items]  
Date of incorporation or acquisition Sep. 30, 2016
Place of incorporation PRC
Percentage of direct ownership by the Company 100.00%