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Related Party Disclosures - Significant Transactions with Related Parties (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Associates and joint ventures [member]        
Disclosure of transactions between related parties [line items]        
Sales of engines and parts ¥ 411,010 $ 59,122 ¥ 393,440 ¥ 1,256,268
Purchase of parts, supplies and engines 1,396,611 200,896 2,036,675 2,792,707
Joint ventures [member]        
Disclosure of transactions between related parties [line items]        
Hospitality, restaurant, consultancy and other service income 5,803 835 2,152 3,918
Service charge charged by 128 18 5,023  
Rental income 4,634 667 4,415 4,565
Selling, general and administrative expenses 0 0 2,530 7,287
Hong Leong Asia Limited [member]        
Disclosure of transactions between related parties [line items]        
Selling, general and administrative expenses 8,994 1,294 7,188 6,687
GY Group (including its subsidiaries and affiliates) [member]        
Disclosure of transactions between related parties [line items]        
Sales of engines and parts 2,262,306 325,423 3,223,785 2,637,845
Purchase of parts, supplies and engines 1,053,607 151,557 1,307,137 1,245,030
Hospitality, restaurant, consultancy and other service income 10,398 1,496 6,609 6,765
Rental income 580 83 275 3,970
Property management service expenses 22,128 3,183 21,978 24,968
Selling, general and administrative expenses 30,151 4,337 9,315 4,728
Delivery, storage, distribution and handling expenses 201,669 29,009 300,699 312,891
Payments For Lease Liabilities 19,802 2,848 17,215 18,086
Purchases of vehicles and machineries ¥ 2,513 $ 361 ¥ 3,460 ¥ 2,838