Related Party Transactions - Summary of Related Parties Relationship with Group (Detail)	12 Months Ended
Dec. 31, 2016
Ping An Group [Member]
Related Party Transaction [Line Items]
Related parties relationship with the group	The Company's controlling shareholder and its subsidiaries
Hunan Mango Autohome Automobile Sales Co Ltd [Member]
Related Party Transaction [Line Items]
Related parties relationship with the group	A equity-method investee of the Company's subsidiary

This element represents a description of the nature of common ownership or management control relationships with other entities, regardless of there being transactions between the entities, when the existence of that control could result in operating results or financial position of the reporting entity significantly different from that which would have been obtained if the entities' were autonomous.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864

Name:	us-gaap_NatureOfCommonOwnershipOrManagementControlRelationships
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration