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Taxation - Additional Information (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Loss Carryforwards [Line Items]
Statutory income tax rate	25.00%
Loss	¥ 51,061,235
Tax losses	1,853,887
Subsidiaries [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	¥ 536,974
Inland Revenue, Hong Kong [Member]
Operating Loss Carryforwards [Line Items]
Statutory income tax rate	16.50%
Tax losses	¥ 908,234
United States [Member]
Operating Loss Carryforwards [Line Items]
Statutory income tax rate	27.98%	27.98%	27.98%
PRC [Member]
Operating Loss Carryforwards [Line Items]
Statutory income tax rate	25.00%
Preferential income tax rate	25.00%
Withholding tax rate	10.00%
Effective income tax rate reconciliation, tax credit, research, percent	75.00%
Loss	¥ 51,061,235
PRC [Member] \| HNTE [Member]
Operating Loss Carryforwards [Line Items]
Statutory income tax rate	25.00%
Preferential income tax rate	15.00%
PRC [Member] \| Beneficial Owner [Member]
Operating Loss Carryforwards [Line Items]
Withholding tax rate	5.00%
Hong Kong and Others [Member]
Operating Loss Carryforwards [Line Items]
Tax losses	¥ 1,853,887