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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 |

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