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Related Party Disclosures - Significant Transactions with Related Parties (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Disclosure of transactions between related parties [line items]        
Sales of an intangible asset to a joint venture ¥ 0 $ 0 ¥ 101,390 ¥ 0
Associates and joint ventures [member]        
Disclosure of transactions between related parties [line items]        
Sales of engines and parts 974,112 135,787 924,971 411,010
Purchase of parts, supplies and engines 1,683,296 234,645 1,614,814 1,396,611
Joint ventures [member]        
Disclosure of transactions between related parties [line items]        
Hospitality, restaurant, consultancy and other service income 11,536 1,608 18,427 5,803
Service charge charged by 833 116 2,094 128
Rental income 2,914 406 3,834 4,634
Hong Leong Asia Limited and its affiliates [member]        
Disclosure of transactions between related parties [line items]        
Selling, general and administrative expenses 8,968 1,250 9,194 8,994
GY and its affiliates [member]        
Disclosure of transactions between related parties [line items]        
Sales of engines and parts 2,120,542 295,595 2,034,304 2,262,306
Purchase of parts, supplies and engines 1,927,305 268,659 1,804,457 1,053,607
Hospitality, restaurant, consultancy and other service income 25,521 3,558 18,023 10,398
Rental income 12,657 1,764 12,227 580
Property management service expenses 22,873 3,188 24,668 22,128
Selling, general and administrative expenses 98,486 13,729 34,178 30,151
Delivery, storage, distribution and handling expenses 183,020 25,512 212,566 201,669
Payments For Lease Liabilities 19,225 2,680 19,615 19,802
Purchases of vehicles and machineries ¥ 0 $ 0 ¥ 0 ¥ 2,513