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Taxation - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Income Tax Disclosure [Line Items] |  |  |  |  |
Unrecognized tax benefits | ¥ 59,049 | ¥ 12,613 | ¥ 0 | $ 9,266 | $ 1,979
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 15,954 | 0 |  | 2,504 |
Liability for Uncertainty in Income Taxes, Noncurrent | 15,954 | 0 |  | 2,504 |
Unrecognized Tax Benefits Setoff Against Deferred Tax Assets | 43,095 | ¥ 12,613 |  | 6,762 |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 0 |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | ¥ 0 |  |  |  |
Tax Withholding on Payment of Interest and Dividends to Non PRC Resident Enterprises [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Tax withholding rates on interest and dividend payments | 10.00% | 10.00% | 10.00% |  |
HK |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Income tax rate | 16.50% | 16.50% | 16.50% |  |
Operating loss carryforwards | ¥ 7,485,149 |  |  | 1,174,583 |
CN |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Income tax rate | 25.00% | 25.00% | 25.00% |  |
Operating loss carryforwards | ¥ 7,485,149 |  |  | $ 1,174,583 |
CN | Beijing Kingsoft Cloud Network Technology Co Ltd | Preferential Income Tax Rate [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Income tax rate | 15.00% |  |  |  |

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