v3.26.1
Summary of Significant Accounting Policies - Additional Information (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accounting Policies [Line Items]      
Restricted cash ¥ 6,071,491 ¥ 3,153,390  
Allowance for credit loss on accounts receivable charged to income statement 126,298 5,572 ¥ 70,357
Allowance for credit loss on accounts receivable current 142,328 63,866  
Allowance for credit loss on accounts receivable non current 75,357 55,932  
Short-term investments 3,217,293 751,290  
Inventory write-downs 555,368 943,734 1,054,711
Research and development expenses 9,489,979 6,456,734 5,276,574
Advertising costs 817,911 664,412 413,832
Selling and marketing expenses total 7,388,109 5,531,599 5,013,734
Employer contribution to defined contribution plan 1,093,885 832,956 750,002
Dividend declared 0 0 0
General and Administrative Expense 2,010,347 1,339,045 1,545,208
Short-term deposits 11,388,834 12,931,757  
Long-term deposits 7,283,859 4,941,362  
Long-term deposits current 3,020,317 452,326  
Impairment of indefinite-lived intangible assets 0 0 0
Other income other subsidies ¥ 1,761,419 589,227 465,588
Lessor, sales-type lease, term of contract 15 years    
Sales-type lease, lease receivables ¥ 206,598 215,823  
Accounts payable 18,001,675 15,181,585  
Notes payable 19,161,724 7,898,896  
Maturity of restricted short-term deposits     1,010,000
Maturities of restricted short term deposits ¥ 433,100 558,000 1,010,000
Maturities of restricted Long term deposits     580,000
License Of Maintenance And Overhauls [Member]      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 26 months    
Robotics Platform Technology [Member]      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
VPT [Member]      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
VMT [Member]      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Bank Deposits for Letter of Credit Bank Notes and a Forward Exchange Contract [Member]      
Accounting Policies [Line Items]      
Restricted cash ¥ 6,015,854 3,148,492  
Deposits Restriction Subject to Settlement of Dispute [Member]      
Accounting Policies [Line Items]      
Restricted cash ¥ 55,637 4,898  
General Reserve Fund [Member]      
Accounting Policies [Line Items]      
Percentage of the after tax profits allocatable to statutory general reserve fund 10.00%    
Appropriations to general reserve fund and statutory surplus fund  ¥ 42,701 34,984 53,610
Minimum [Member]      
Accounting Policies [Line Items]      
Land use rights amortisation period 12 years    
Credit derivative, term 0 days    
Minimum [Member] | Software and Software Development Costs [Member]      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Minimum [Member] | Others [Member]      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Minimum [Member] | General Reserve Fund [Member]      
Accounting Policies [Line Items]      
Statutory reserves as a percentage of the reserved capital of the company 50.00%    
Maximum [Member]      
Accounting Policies [Line Items]      
Land use rights amortisation period 50 years    
Credit derivative, term 60 days    
Maximum [Member] | Software and Software Development Costs [Member]      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Maximum [Member] | Others [Member]      
Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
CHINA      
Accounting Policies [Line Items]      
Short-term deposits ¥ 11,388,834 ¥ 12,931,757  
Vehicles [Member] | Minimum [Member]      
Accounting Policies [Line Items]      
Product warranty period   2 years  
Vehicles [Member] | Maximum [Member]      
Accounting Policies [Line Items]      
Product warranty period   6 years  
Cost of Sales [Member]      
Accounting Policies [Line Items]      
Inventory write-downs 555,368 ¥ 943,734 1,054,711
Operating Expense [Member]      
Accounting Policies [Line Items]      
Gain loss on the disposal of propery plant and equipment ¥ 25,967 ¥ 21,787 ¥ 4,863