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Taxation - Additional Information (Detail) ¥ in Thousands, $ in Millions |  |  |  | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2021 | Jan. 01, 2008 | Mar. 16, 2007 | Dec. 31, 2024 HKD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 | Dec. 31, 2027 CNY (¥) | Dec. 31, 2024 CNY (¥)
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Percentage of Value added tax rate |  |  |  | 6.00% |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 0.00% | 4.10% | 0.80% |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 25.00% | 25.00% | 25.00% |  |
Income Tax Rate on Global Income |  |  |  | 25.00% |  |  |  |
Uniform Tax Rate |  |  |  | 25.00% |  |  |  |
Tax on Undistributed Dividends |  |  |  | 10.00% |  |  |  |
Tax on Foreign Investor |  |  |  | 5.00% |  |  |  |
Investor Owns Share |  |  |  | 25.00% |  |  |  |
Deferred tax assets, valuation allowance |  |  |  |  | ¥ 521,462 |  |  | ¥ 456,578
Consolidated Entity Variable Interest Entities VIE [Member] |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  | ¥ 1,870,574 |  |  | ¥ 1,905,882
HK |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Profit In Income Tax Regime | $ |  |  |  | $ 2 |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 8.25% |  |  |  |
HK | Maximum [Member] |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Profit In Income Tax Regime | $ |  |  |  | $ 2 |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 16.50% |  |  |  |
CN | Enterprise Income Tax Law [Member] |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 25.00% |  |  |  |  |
Preferential Tax Rate | 15.00% | 15.00% |  |  |  |  |  |
PRC entities [Member] |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  |  |  | 20.00% |
Income loss before tax subject to tax |  |  |  |  |  |  | 25.00% |
Percentage of profit before tax subject to tax |  |  |  |  |  |  | ¥ 3,000 |

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