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Convertible Promissory Note Payable - Summary of Convertible Promissory Note Payable (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Convertible Promissory Note Payable [Line Items]      
Beginning balance ¥ 10,117,188    
Beginning balance 10,117,188    
Interest paid (867,715) ¥ (1,151,421) ¥ (499,493)
Ending balance 10,669,498 10,117,188  
Ending balance 10,669,498 10,117,188  
Convertible Promissory Note Payable [member] | Liability [Member]      
Disclosure of Convertible Promissory Note Payable [Line Items]      
Beginning balance 10,117,188 10,014,377 9,134,809
Interest accrued at effective interest rate 893,001 883,759 819,754
Interest paid (100,937) (92,981) (100,522)
Exchange differences (239,754) (687,967) 160,336
Ending balance 10,669,498 10,117,188 10,014,377
Convertible Promissory Note Payable [member] | Equity [member]      
Disclosure of Convertible Promissory Note Payable [Line Items]      
Beginning balance 5,744,955 5,744,955 5,744,955
Ending balance ¥ 5,744,955 ¥ 5,744,955 ¥ 5,744,955