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Intangible Assets - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Intangible asset, carrying amount | ¥ 10,122,000 |  | ¥ 81,826,000 |  |  | $ 1,599
Impairment charge | ¥ 40,000,000 | $ 6,320 | ¥ 0 | ¥ 26,700,000 |  |
Projected cash flows forecast period | 10 years | 10 years | 15 years |  |  |
Projected cash flows forecast period for growth rate | 6 years | 6 years | 5 years |  |  |
Revenue growth rate | 6.50% |  | 6.50% |  |  | 6.50%
Later Than One Year And Not Later Than Fifteen Year [member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Pre-tax discount rate | 13.69% |  |  |  |  | 13.69%
Later Than One Year And Not Later Than Ten Year [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Pre-tax discount rate |  |  | 12.98% |  |  |
Sixth Year [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Revenue growth rate | 15.60% |  | 6.70% |  |  | 15.60%
Later than six years and not later than fifteen years [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Revenue growth rate | 0.00% |  | 0.00% |  |  | 0.00%
Technology development cost [member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Impairment charge |  |  |  | ¥ 26,700,000 | ¥ 60,000,000 |
Jining Yuchai Engine Company Limited [Member] | One Percent Increase in Discount Rate [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Impairment charge | ¥ 6,731,000 | $ 1,063 | ¥ 2,443,000 |  |  |
Jining Yuchai Engine Company Limited [Member] | Technology development cost [member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Intangible asset, carrying amount | 10,122,000 |  | ¥ 50,122,000 |  |  | $ 1,599
Impairment charge | ¥ 40,000,000 | $ 6,320 |  |  |  |
Jining Yuchai Engine Company Limited [Member] | Technology development cost [member] | Bottom of range [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Expected useful life of intangible assets | 10 years | 10 years |  |  |  |
Jining Yuchai Engine Company Limited [Member] | Technology development cost [member] | Top of range [Member] |  |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |  |
Expected useful life of intangible assets | 15 years | 15 years |  |  |  |

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