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Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, ¥ in Thousands |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 05, 2021 USD ($) $ / shares shares | Apr. 01, 2019 | Mar. 30, 2019 | May 01, 2018 | Dec. 31, 2021 CNY (¥) Segment Customer shares | Dec. 31, 2021 USD ($) Segment Customer | Dec. 31, 2020 CNY (¥) Customer shares | Dec. 31, 2019 CNY (¥) Customer | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 30, 2021 | Dec. 31, 2020 $ / shares
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate of one US$ to RMB |  |  |  |  |  |  |  |  |  |  | 6.3726 |
Goodwill |  |  |  |  |  | ¥ 4,071,391 |  | ¥ 4,071,391 |  | $ 638,890,000 |  |
Goodwill, impairment loss | ¥ |  |  |  |  |  | 0 |  | 0 | ¥ 0 |  |  |
Deferred revenue, revenue recognized |  |  |  |  |  | 1,315,667 | $ 206,457,000 |  |  |  |  |
Contract liability | ¥ |  |  |  |  |  | ¥ 0 |  |  |  |  |  |
Revenue, practical expedient, incremental cost of obtaining contract |  |  |  |  |  | true | true |  |  |  |  |
Advertising expenditures |  |  |  |  |  | ¥ 1,341,623 | $ 210,530,000 | 1,795,330 | 1,649,660 |  |  |
Number of operating segment | Segment |  |  |  |  |  | 1 | 1 |  |  |  |  |
Total expenses for employee benefits |  |  |  |  |  | ¥ 418,517 | $ 65,677,000 | ¥ 241,951 | ¥ 344,829 |  |  |
Foreign currency exchange rate appreciation (depreciation) |  |  |  |  |  | 2.40% | 2.40% | 6.70% | (1.20%) |  |  |
Weighted Average Remaining Lease Term |  |  |  |  |  | 1 year 1 month 6 days |  |  |  | 1 year 1 month 6 days |  |
Weighted average discount rate |  |  |  |  |  | 6.69% |  |  |  | 6.69% |  |
Operating leases, rental expenses |  |  |  |  |  | ¥ 138,009 | $ 21,657,000 | ¥ 119,855 | ¥ 72,185 |  |  |
Common stock shares value | [1] |  |  |  |  | ¥ 8,523 |  | ¥ 8,089 |  | $ 1,337,000 |  |
Common stock shares authorised | shares |  |  |  |  |  | 400,000,000,000 |  | 400,000,000,000 |  | 400,000,000,000 |  |
Common stock shares par value per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.0025 |  | $ 0.0025
Gain loss on short term investment |  |  |  |  |  | ¥ 164,070 | 25,746,000 |  |  |  |  |
ADR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares value | $ |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Common stock shares authorised | shares |  | 400,000,000,000 |  |  |  |  |  |  |  |  |  |
Common stock shares par value per share | $ / shares |  | $ 0.0025 |  |  |  |  |  |  |  |  |  |
Stock holders equity note stock split |  | one ADS representing four ordinary shares |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Government grants |  |  |  |  |  | 51,685 | 8,111,000 | ¥ 210,022 | 147,694 |  |  |
Vat Refunds |  |  |  |  |  | 231,452 | $ 36,320,000 | 218,412 | ¥ 293,008 |  |  |
Credit Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, restricted cash and term deposits |  |  |  |  |  | ¥ 20,827,823 |  | ¥ 14,647,324 |  | $ 3,268,339,000 |  |
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 |  |  |
Customer Concentration Risk [Member] | Net Revenues [Member] | Customer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 10.00% | 10.00% | 10.00% | 10.00% |  |  |
Beijing Prbrownies Software Co., Ltd. | Other income, net |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value added tax refund rate |  |  |  | 13.00% |  | 10.00% | 10.00% |  |  |  |  |
Tianjin Autohome Software Co., Ltd. [Member] | Other income, net |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value added tax refund rate |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |
Leads Generation Services [Member] | Beijing Prbrownies Software Co., Ltd. | Other income, net | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value added tax rate |  |  | 13.00% |  |  |  |  |  |  |  |  |
Value added tax rate after refund |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |
Leads Generation Services [Member] | Beijing Prbrownies Software Co., Ltd. | Other income, net | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value added tax rate |  |  |  | 16.00% |  |  |  |  |  |  |  |
Leads Generation Services [Member] | Tianjin Autohome Software Co., Ltd. [Member] | Other income, net | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value added tax rate |  |  |  | 16.00% |  | 13.00% | 13.00% |  |  |  |  |
Value added tax rate after refund |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |
[1] | Par value per share and the number of shares have been retrospectively adjusted for the Share Subdivision and the ADS Ratio Change that were effective on February 5, 2021 as detailed in Note 2(a).

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