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Investments in Subsidiaries - Subsidiary having Non-controlling Interests that are Material to the Group (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Disclosure of subsidiaries [line items]          
Accumulated balances of material NCI ¥ 2,805,856   ¥ 2,751,705   $ 396,022
Profit allocated to material NCI ¥ 255,786 $ 36,102 ¥ 279,134 ¥ 431,047  
Guangxi Yuchai Machinery Company Lmited [member]          
Disclosure of subsidiaries [line items]          
Proportion of equity interest held by NCI 23.60% 23.60% 23.60% 23.60%  
Accumulated balances of material NCI ¥ 2,603,227   ¥ 2,556,644   $ 367,423
Profit allocated to material NCI 254,284 $ 35,890 252,394 ¥ 270,452  
Dividends paid to material NCI ¥ 207,514 $ 29,289 ¥ 135,905 ¥ 98,941