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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, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers ¥ 20,581,170 $ 3,180,376 ¥ 18,016,085 ¥ 16,263,248
At a point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 20,518,030 3,170,619 17,935,600 16,166,390
Over time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 63,140 9,757 80,485 96,858
People's Republic of China [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 20,504,288 3,168,496 17,913,615 16,119,896
Other countries [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 76,882 11,880 102,470 143,352
Heavy-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 6,725,312 1,039,252 6,189,934 4,934,435
Medium-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 6,626,629 1,024,003 5,583,982 5,537,164
Light-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 2,356,168 364,095 2,429,248 2,481,554
Other Products And Services [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 4,809,921 743,269 3,732,436 3,213,237
Revenue from hospitality operations [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 63,140 $ 9,757 80,485 96,858
Yuchai segment [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 20,557,660   17,980,304 16,210,467
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 20,518,030   17,935,600 16,166,390
Yuchai segment [member] | Over time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 39,630   44,704 44,077
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 20,504,288   17,913,615 16,119,896
Yuchai segment [member] | Other countries [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 53,372   66,689 90,571
Yuchai segment [member] | Heavy-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 6,725,312   6,189,934 4,934,435
Yuchai segment [member] | Medium-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 6,626,629   5,583,982 5,537,164
Yuchai segment [member] | Light-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 2,356,168   2,429,248 2,481,554
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 4,809,921   3,732,436 3,213,237
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 39,630   44,704 44,077
HL Global Enterprises Limited segment [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contracts with customers 23,510   35,781 52,781
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 23,510   35,781 52,781
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 23,510   35,781 52,781
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 ¥ 23,510   ¥ 35,781 ¥ 52,781