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Taxation - Additional Information (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands, $ in Millions |  |  | 12 Months Ended |
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Nov. 04, 2019 | Apr. 01, 2018 HKD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 CNY (¥) ¥ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 CNY (¥) ¥ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) ¥ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  | ¥ 34,006 | $ 5,336 | ¥ 260,945 |  | ¥ 500,361 |  |
Current income tax expense |  |  |  |  | 185,194 | 29,061 | 283,372 |  | 355,398 |  |
Deferred income tax expense |  |  |  |  | ¥ (151,188) | $ (23,725) | ¥ (22,427) |  | ¥ 144,963 |  |
Effect of preferential tax rate, basic earning per ADS | (per share) |  |  |  |  | ¥ 1.11 | $ 0.17 | ¥ 0.97 |  | ¥ 0.68 |  |
Withholding tax on dividend payment |  |  |  |  | ¥ 164,946 | $ 25,884 | ¥ 76,610 |  | ¥ 71,056 |  |
Undistributed earnings from PRC Subsidiaries |  |  |  |  | 14,620,442 |  | 13,674,190 |  |  |  | $ 2,294,266
Unrecognized tax benefits that would impact effective tax rate | ¥ |  |  |  |  | 0 |  | 14,247 |  |  |  |
Dividend declared percent on net income | 20.00% |  |  |  |  |  |  |  |  |  |
Statutory Income Tax Rate, Amount |  |  |  |  | ¥ 544,290 | $ 85,411 | 917,128 |  | 925,253 |  |
Income tax dividend rate |  |  |  |  | 10.00% | 10.00% |  |  |  |  |
Dividend Declared [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Withholding tax on dividend payment |  |  |  |  | ¥ 53,835 | $ 8,448 | ¥ 76,610 |  | ¥ 71,056 |  |
VIEs [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Enterprise income tax rate |  |  |  |  | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% |
Hong Kong [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  | 16.50% |  |  |  |  |  |  |  |  |
Hong Kong [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  | 8.25% |  |  |  |  |  |  |  |  |
Hong Kong [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0 |
Hong Kong [Member] | Two Tired Profits Tax Regime [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory Income Tax Rate, Amount |  | $ 2 |  |  |  |  |  |  |  |  |
China [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  |  |  | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% |
Effect of change in enacted tax rate |  |  |  |  | ¥ 348,593 | $ 54,702 | ¥ 331,952 |  | ¥ 150,714 |  |
Current income tax expense |  |  |  |  | 317,944 | 49,892 | 371,826 |  | 151,645 |  |
Deferred income tax expense |  |  |  |  | 30,649 | $ 4,810 | ¥ 39,874 |  | ¥ 931 |  |
Net tax operating losses |  |  |  |  | ¥ 2,022,137 |  |  |  |  |  | $ 317,317
Net tax operating losses expiration year |  |  |  |  | 2022 | 2022 |  |  |  |  |
Withholding income tax rate on dividends distributed by FIEs |  |  |  |  | 10.00% | 10.00% |  |  |  |  |
China [Member] | Chengdu Prbrownies Software Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  |  |  | 25.00% | 25.00% |  |  |  |  |
Reduction in statutory income tax rate |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
China [Member] | Chengdu Prbrownies Software Co., Ltd. [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  | 25.00% | 25.00% |  |  |  |  |  |  |
Reduction in statutory income tax rate |  |  | 50.00% | 50.00% |  |  |  |  |  |  |
China [Member] | Chezhiying WFOE [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  |  |  | 25.00% | 25.00% |  |  |  |  |
Reduction in statutory income tax rate |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
China [Member] | Chezhiying WFOE [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  | 25.00% | 25.00% |  |  |  |  |  |  |
Reduction in statutory income tax rate |  |  | 50.00% | 50.00% |  |  |  |  |  |  |
China [Member] | Hainan Chezhiyitong Information Technology Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  |  |  | 25.00% | 25.00% |  |  |  |  |
Reduction in statutory income tax rate |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
China [Member] | Hainan Chezhiyitong Information Technology Co., Ltd. [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  | 25.00% | 25.00% |  |  |  |  |  |  |
Reduction in statutory income tax rate |  |  | 50.00% | 50.00% |  |  |  |  |  |  |
China [Member] | Tianjin Autohome Software Co., Ltd [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  |  |  | 25.00% | 25.00% |  |  |  |  |
Reduction in statutory income tax rate |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
China [Member] | Tianjin Autohome Software Co., Ltd [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Statutory EIT rate |  |  | 25.00% | 25.00% |  |  |  |  |  |  |
Reduction in statutory income tax rate |  |  | 50.00% | 50.00% |  |  |  |  |  |  |
China [Member] | High-New Technology Enterprise [Member] | Beijing Autohome Technologies Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferential statutory tax rate |  |  |  |  | 15.00% | 15.00% |  |  | 10.00% | 10.00% |
China [Member] | High-New Technology Enterprise [Member] | Chengdu Prbrownies Software Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferential statutory tax rate |  |  |  |  |  |  |  |  | 10.00% | 10.00% |
China [Member] | High-New Technology Enterprise [Member] | Beijing Prbrownies Software Co., Ltd. (formerly known as Beijing Autohome Software Co., Ltd.) [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferential statutory tax rate |  |  |  |  | 15.00% | 15.00% | 10.00% | 10.00% | 10.00% | 10.00% |
China [Member] | High-New Technology Enterprise [Member] | Autohome WFOE [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferential statutory tax rate |  |  |  |  | 15.00% | 15.00% |  |  | 10.00% | 10.00% |
China [Member] | High-New Technology Enterprise [Member] | Chezhiying WFOE [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferential statutory tax rate |  |  |  |  | 15.00% | 15.00% |  |  |  |  |
China [Member] | High-New Technology Enterprise [Member] | Hainan Chezhiyitong Information Technology Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferential statutory tax rate |  |  |  |  | 15.00% | 15.00% |  |  |  |  |
China [Member] | High-New Technology Enterprise [Member] | Tianjin Autohome Software Co., Ltd [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferential statutory tax rate |  |  |  |  | 15.00% | 15.00% |  |  |  |  |
China [Member] | Reduction in Taxes [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Withholding income tax rate on dividends distributed by FIEs |  |  |  |  | 5.00% | 5.00% |  |  |  |  |

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