Cash and cash equivalents, term deposits and restricted cash deposited with financial institutions. Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. Restricted cash is the cash and cash equivalent items which are restricted as to withdrawal or usage.

No definition available.

Summary of Significant Accounting Policies - Additional Information (Detail)	1 Months Ended	12 Months Ended				26 Months Ended
	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 CNY (¥) Customer Segment	Dec. 31, 2016 USD ($) Customer Segment	Dec. 31, 2015 CNY (¥) Customer	Dec. 31, 2014 CNY (¥) Customer	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 30, 2016
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Exchange rate of one US$ to RMB								6.9430
Goodwill, impairment loss		¥ 0	$ 0	¥ 0
Long-lived assets, impairment charge		0	0	0	¥ 0
Recorded rebates and cash incentives to advertising agencies companies		653,481,000	94,121,000	578,548,000	395,175,000
Advertising expenditures		¥ 756,073,000	$ 108,897,000	533,632,000	266,942,000
Minimum percentage of estimated remaining economic life, Capital lease classification requirement		75.00%	75.00%
Minimum percentage of net present value of minimum lease payments over the fair value of leased property		90.00%	90.00%
Number of operating segment \| Segment		1	1
Total expenses for employee benefits		¥ 214,596,000	$ 30,908,000	¥ 134,125,000	¥ 61,532,000
Foreign currency exchange rate appreciation (depreciation)		(6.70%)	(6.70%)	(4.20%)	(2.40%)
Accounting Standards Update 2015-05 [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Capitalized internally-developed software development costs		¥ 6,126,000	$ 882,000	¥ 1,326,000	¥ 0
Amortization expense for capitalized software costs		1,227,000	177,000	93,000	0
Unamortized amount of capitalized internal use software development costs	¥ 6,132,000	6,132,000		1,233,000		¥ 6,132,000	$ 883,000
Other income, net
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Government grants		12,576,000	$ 1,811,000	11,281,000	¥ 2,984,000
Credit Concentration Risk [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents, restricted cash and term deposits	5,733,321,000	¥ 5,733,321,000		¥ 4,169,053,000		5,733,321,000	825,770,000
Customer Concentration Risk [Member] \| Net Revenues [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Number of customers represented greater than 10% \| Customer		0	0	0	0
Consolidated VIEs [Member] \| Currency Convertibility Risk [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents, restricted cash and term deposits	58,123,000	¥ 58,123,000				58,123,000	8,371,000
Subsidiaries [Member] \| Currency Convertibility Risk [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents, restricted cash and term deposits	¥ 4,746,982,000	¥ 4,746,982,000				¥ 4,746,982,000	$ 683,708,000
Media and Leads Generation Services [Member] \| Beijing Prbrownies Software Co., Ltd. (formerly known as Beijing Autohome Software Co., Ltd.) [Member] \| Consolidated VIEs [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Tax rate of value-added tax						17.00%
Value-added tax refund rate						14.00%
Media and Leads Generation Services [Member] \| Chengdu Prbrownies Software Company Limited [Member] \| Consolidated VIEs [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Tax rate of value-added tax	17.00%
Value-added tax refund rate	14.00%
China [Member] \| Media and Leads Generation Services [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Tax rate of value-added tax		6.00%	6.00%	6.00%	6.00%
China [Member] \| Online Marketplace [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Tax rate of value-added tax		17.00%	17.00%