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Related Party Disclosures - Significant Transactions with Related Parties (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Disclosure of transactions between related parties [line items]        
Payment for Trademark Usage Fee ¥ 0 $ 0 ¥ 0 ¥ 169,811
Associates and joint ventures [member]        
Disclosure of transactions between related parties [line items]        
Sales of engines and materials 393,440 62,232 1,256,268 912,877
Purchase of material, supplies and engines 2,036,675 322,146 2,792,707 1,999,831
Joint ventures [member]        
Disclosure of transactions between related parties [line items]        
Hospitality, restaurant, consultancy and other service income 2,152 340 3,918 3,984
Service charge charged by 5,023 795    
Rental income 4,415 698 4,565 3,206
Selling, general and administrative expenses 2,530 400 7,287  
Hong Leong Asia Limited [member]        
Disclosure of transactions between related parties [line items]        
Selling, general and administrative expenses 7,188 1,137 6,687 6,788
GY Group (including its subsidiaries and affiliates) [member]        
Disclosure of transactions between related parties [line items]        
Sales of engines and materials 3,223,785 509,915 2,637,845 1,792,280
Purchase of material, supplies and engines 1,307,137 206,754 1,245,030 1,895,239
Hospitality, restaurant, consultancy and other service income 6,609 1,045 6,765 15,350
Rental income 275 43 3,970 2,133
Property management service expenses 21,978 3,476 24,968 22,595
Selling, general and administrative expenses 9,315 1,473 4,728 19,953
Delivery, storage, distribution and handling expenses 300,699 47,562 312,891 304,532
Payment for Trademark Usage Fee 0 0   169,811
Payments For Lease Liabilities 17,215 2,723 18,086 33,594
Purchases of vehicles and machineries ¥ 3,460 $ 547 ¥ 2,838 ¥ 2,817