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Convertible Redeemable Preferred Shares - Schedule of Activities of Preference Stock (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
CNY (¥)
shares
Temporary Equity [Line Items]      
Beginning balance (in shares) | shares 109,481,969 109,481,969 109,481,969
Beginning balance ¥ 3,563,681   ¥ 3,554,229
Net accretion on convertible redeemable preferred shares to redemption value ¥ 290,543   ¥ 9,452
Deemed contribution to ordinary shareholders due to modifications and extinguishment on convertible redeemable preferred shares ( in shares) | shares 15,672,203 15,672,203  
Deemed contribution to ordinary shareholders due to modifications and extinguishment on convertible redeemable preferred shares ¥ (672,170) $ (92,087)  
Deemed dividend to convertible redeemable preferred share shareholders due to modifications and re-designation ¥ 5,940 $ 814  
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ( in shares) | shares (125,154,172) (125,154,172)  
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ¥ (3,187,994)    
Ending balance (in shares) | shares 0 0 109,481,969
Ending balance ¥ 0   ¥ 3,563,681
Series A Shares      
Temporary Equity [Line Items]      
Beginning balance (in shares) | shares 15,040,570 15,040,570 15,040,570
Beginning balance ¥ 408,139   ¥ 574,512
Net accretion on convertible redeemable preferred shares to redemption value 31,684   ¥ (166,373)
Deemed contribution to ordinary shareholders due to modifications and extinguishment on convertible redeemable preferred shares (30,405)    
Deemed dividend to convertible redeemable preferred share shareholders due to modifications and re-designation ¥ (8,583)    
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ( in shares) | shares (15,040,570) (15,040,570)  
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ¥ (400,835)    
Ending balance (in shares) | shares 0 0 15,040,570
Ending balance ¥ 0   ¥ 408,139
Series B Shares      
Temporary Equity [Line Items]      
Beginning balance (in shares) | shares 7,085,330 7,085,330 7,085,330
Beginning balance ¥ 199,518   ¥ 329,406
Net accretion on convertible redeemable preferred shares to redemption value 14,606   ¥ (129,888)
Deemed contribution to ordinary shareholders due to modifications and extinguishment on convertible redeemable preferred shares (12,730)    
Deemed dividend to convertible redeemable preferred share shareholders due to modifications and re-designation ¥ (5,041)    
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ( in shares) | shares (7,085,330) (7,085,330)  
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ¥ (196,353)    
Ending balance (in shares) | shares 0 0 7,085,330
Ending balance ¥ 0   ¥ 199,518
Series C Shares      
Temporary Equity [Line Items]      
Beginning balance (in shares) | shares 23,786,590 23,786,590 23,786,590
Beginning balance ¥ 493,788   ¥ 453,926
Net accretion on convertible redeemable preferred shares to redemption value 31,438   ¥ 39,862
Deemed contribution to ordinary shareholders due to modifications and extinguishment on convertible redeemable preferred shares (58,026)    
Deemed dividend to convertible redeemable preferred share shareholders due to modifications and re-designation ¥ (8,659)    
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ( in shares) | shares (23,786,590) (23,786,590)  
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ¥ (458,541)    
Ending balance (in shares) | shares 0 0 23,786,590
Ending balance ¥ 0   ¥ 493,788
Series D Shares      
Temporary Equity [Line Items]      
Beginning balance (in shares) | shares 37,152,161 37,152,161 37,152,161
Beginning balance ¥ 1,059,434   ¥ 959,436
Net accretion on convertible redeemable preferred shares to redemption value 76,076   ¥ 99,998
Deemed contribution to ordinary shareholders due to modifications and extinguishment on convertible redeemable preferred shares (90,632)    
Deemed dividend to convertible redeemable preferred share shareholders due to modifications and re-designation ¥ (203)    
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ( in shares) | shares (37,152,161) (37,152,161)  
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ¥ (1,044,675)    
Ending balance (in shares) | shares 0 0 37,152,161
Ending balance ¥ 0   ¥ 1,059,434
Series E Shares      
Temporary Equity [Line Items]      
Beginning balance (in shares) | shares 26,417,318 26,417,318 26,417,318
Beginning balance ¥ 1,402,802   ¥ 1,236,949
Net accretion on convertible redeemable preferred shares to redemption value ¥ 136,739   ¥ 165,853
Deemed contribution to ordinary shareholders due to modifications and extinguishment on convertible redeemable preferred shares ( in shares) | shares 15,672,203 15,672,203  
Deemed contribution to ordinary shareholders due to modifications and extinguishment on convertible redeemable preferred shares ¥ (480,377)    
Deemed dividend to convertible redeemable preferred share shareholders due to modifications and re-designation ¥ 28,426    
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ( in shares) | shares (42,089,521) (42,089,521)  
Conversion of convertible redeemable preferred shares to Class A ordinary shares upon the consummation of IPO ¥ (1,087,590)    
Ending balance (in shares) | shares 0 0 26,417,318
Ending balance ¥ 0   ¥ 1,402,802