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Taxation - Schedule of the components of loss before tax (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Income Before Income Tax Domestic And Foreign [Line Items]      
Total loss before tax ¥ (92,053) ¥ (239,709) ¥ (645,686)
Current income tax expense 0 0 0
Deferred income tax benefit 0 9,871 5,391
Total income tax benefit 0 9,871 5,391
Loss from PRC entities [Member]      
Schedule Of Income Before Income Tax Domestic And Foreign [Line Items]      
Total loss before tax (176,456) (307,901) (607,635)
(Loss)/gain from overseas entities [Member]      
Schedule Of Income Before Income Tax Domestic And Foreign [Line Items]      
Total loss before tax ¥ 84,403 ¥ 68,192 ¥ (38,051)