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Revenue from Contracts with Customers - Summary of Disaggregation of Group's Revenue from Contracts with Customers (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers ¥ 18,016,085 $ 2,542,813 ¥ 16,263,248 ¥ 16,197,819
At a point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 17,935,600 2,531,453 16,166,390 16,098,876
Over time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 80,485 11,360 96,858 98,943
People's Republic of China [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 17,913,615 2,528,350 16,119,896 16,090,726
Other countries [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 102,470 14,463 143,352 107,093
Heavy-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 6,189,934 873,655 4,934,435 5,182,930
Medium-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 5,583,982 788,130 5,537,164 5,620,202
Light-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 2,429,248 342,867 2,481,554 2,147,728
Other Products And Services [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 3,732,436 526,801 3,213,237 3,148,016
Revenue from hospitality operations [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 80,485 $ 11,360 96,858 98,943
Yuchai segment [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 17,980,304   16,210,467 16,140,622
Yuchai segment [member] | At a point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 17,935,600   16,166,390 16,098,876
Yuchai segment [member] | Over time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 44,704   44,077 41,746
Yuchai segment [member] | People's Republic of China [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 17,913,615   16,119,896 16,073,461
Yuchai segment [member] | Other countries [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 66,689   90,571 67,161
Yuchai segment [member] | Heavy-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 6,189,934   4,934,435 5,182,930
Yuchai segment [member] | Medium-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 5,583,982   5,537,164 5,620,202
Yuchai segment [member] | Light-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 2,429,248   2,481,554 2,147,728
Yuchai segment [member] | Other Products And Services [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 3,732,436   3,213,237 3,148,016
Yuchai segment [member] | Revenue from hospitality operations [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 44,704   44,077 41,746
HL Global Enterprises Limited segment [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 35,781   52,781 57,197
HL Global Enterprises Limited segment [member] | At a point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 0      
HL Global Enterprises Limited segment [member] | Over time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 35,781   52,781 57,197
HL Global Enterprises Limited segment [member] | People's Republic of China [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers       17,265
HL Global Enterprises Limited segment [member] | Other countries [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 35,781   52,781 39,932
HL Global Enterprises Limited segment [member] | Heavy-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 0      
HL Global Enterprises Limited segment [member] | Medium-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 0      
HL Global Enterprises Limited segment [member] | Light-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 0      
HL Global Enterprises Limited segment [member] | Other Products And Services [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 0      
HL Global Enterprises Limited segment [member] | Revenue from hospitality operations [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers ¥ 35,781   ¥ 52,781 ¥ 57,197