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Related Party Disclosures - Significant Transactions with Related Parties (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Disclosure of transactions between related parties [line items]        
Payment for Trademark Usage Fee     ¥ 169,811  
Associates and joint ventures [member]        
Disclosure of transactions between related parties [line items]        
Sales of engines and materials ¥ 1,256,268 $ 194,129 912,877 ¥ 439,106
Purchase of material, supplies and engines 2,792,707 431,553 1,999,831 1,192,322
Joint ventures [member]        
Disclosure of transactions between related parties [line items]        
Hospitality, restaurant, consultancy and other service income 3,918 605 3,984 3,456
Rental income 4,565 705 3,206 1,937
Selling, general and administrative expenses 7,287 1,126    
Hong Leong Asia Limited [member]        
Disclosure of transactions between related parties [line items]        
Selling, general and administrative expenses 6,687 1,033 6,788 6,639
GY Group (including its subsidiaries and affiliates) [member]        
Disclosure of transactions between related parties [line items]        
Sales of engines and materials 2,637,845 407,622 1,792,280 406,422
Purchase of material, supplies and engines 1,245,030 192,393 1,895,239 1,589,638
Hospitality, restaurant, consultancy and other service income 6,765 1,045 15,350 24,015
Rental income 3,970 613 2,133 3,886
Property management service expenses 24,968 3,858 22,595 26,547
Leasing expenses       25,705
Selling, general and administrative expenses 4,728 731 19,953 21,607
Delivery, storage, distribution and handling expenses 312,891 48,351 304,532 228,195
Payment for Trademark Usage Fee     169,811  
Payments For Lease Liabilities 18,086 2,795 33,594  
Purchases of vehicles and machineries ¥ 2,838 $ 439 ¥ 2,817 ¥ 6,144