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Goodwill - Additional Information (Detail) - CNY (¥)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of information for cash-generating units [Line Items]    
Impairment on goodwill   ¥ 1,131,000
Long term rates used to extrapolate the budget 6.50% 6.50%
Percentage decrease in profit from operation that would result in an impairment 2.37% 11.63%
Pre-tax discount rate that would result in an impairment 14.82% 12.52%
Long term growth rate that would result in an impairment 2.98% 5.32%
Guangxi Yuchai Machinery Company Limited [Member]    
Disclosure of information for cash-generating units [Line Items]    
Pre-tax discount rate applied to cash flow projection 12.84% 11.73%
Impairment on goodwill ¥ 0