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Optionally Convertible Promissory Notes - Summary of Ordinary Shares To Be Issued To The Holders of Optionally Convertible Promissory Notes (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of ordinary shares to be issued to the holders of optionally convertible promissory notes [Line Items]      
Interest paid ¥ (867,715) ¥ (1,151,421) ¥ (499,493)
Ending balance 7,405,103 7,530,542  
Optionally convertible promissory notes [member] | Liability [Member]      
Disclosure Of ordinary shares to be issued to the holders of optionally convertible promissory notes [Line Items]      
Initial recognition upon C-round restructuring   7,762,475  
Interest accrued at effective interest rate 495,079 127,509  
Interest paid (446,953)    
Exchange differences (173,565) (359,442)  
Ending balance 7,405,103 7,530,542  
Optionally convertible promissory notes [member] | Equity [member]      
Disclosure Of ordinary shares to be issued to the holders of optionally convertible promissory notes [Line Items]      
Initial recognition upon C-round restructuring   1,489,748  
Ending balance ¥ 1,489,748 ¥ 1,489,748