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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, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers $ 2,430,942 ¥ 16,263,248 ¥ 16,197,819 ¥ 13,643,195
At a point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers 2,416,464 16,166,390 16,098,876 13,535,410
Over time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers 14,478 96,858 98,943 107,785
People's Republic of China [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers 2,409,515 16,119,896 16,090,726 13,460,634
Other countries [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers 21,427 143,352 107,093 182,561
Heavy-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers 737,573 4,934,435 5,182,930 3,813,500
Medium-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers 827,665 5,537,164 5,620,202 5,213,373
Light-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers 370,929 2,481,554 2,147,728 1,724,616
Other Products And Services [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers 480,297 3,213,237 3,148,016 2,783,921
Revenue from hospitality operations [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers $ 14,478 96,858 98,943 107,785
Yuchai segment [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   16,210,467 16,140,622 13,576,842
Yuchai segment [member] | At a point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   16,166,390 16,098,876 13,535,410
Yuchai segment [member] | Over time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   44,077 41,746 41,432
Yuchai segment [member] | People's Republic of China [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   16,119,896 16,073,461 13,436,629
Yuchai segment [member] | Other countries [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   90,571 67,161 140,213
Yuchai segment [member] | Heavy-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   4,934,435 5,182,930 3,813,500
Yuchai segment [member] | Medium-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   5,537,164 5,620,202 5,213,373
Yuchai segment [member] | Light-duty engines [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   2,481,554 2,147,728 1,724,616
Yuchai segment [member] | Other Products And Services [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   3,213,237 3,148,016 2,783,921
Yuchai segment [member] | Revenue from hospitality operations [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   44,077 41,746 41,432
HL Global Enterprises Limited segment [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   52,781 57,197 66,353
HL Global Enterprises Limited segment [member] | Over time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   52,781 57,197 66,353
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 contract with customers     17,265 24,005
HL Global Enterprises Limited segment [member] | Other countries [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Total revenue from contract with customers   52,781 39,932 42,348
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 contract with customers   ¥ 52,781 ¥ 57,197 ¥ 66,353