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Significant Accounting Judgments, Estimates and Assumptions - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥)
Disclosure of changes in accounting estimates [Line Items] |  |  |  |  |  |  |
Carrying amounts of deferred tax assets |  | ¥ 315,390 |  | ¥ 308,207 | $ 49,829 |  |
Increase in profit if all unrecognized deferred tax asset were recognized |  | 182,726 | $ 28,869 | 189,589 |  |  |
Carrying amounts of allowance for doubtful accounts |  | 43,775 |  | 54,634 | 6,916 | $ 8,632 | ¥ 51,288
Carrying amounts of inventory provision |  | 106,895 |  | 126,796 | 16,889 |  |
Provision of product warranty |  | ¥ 290,306 |  | 238,850 | 45,866 |  |
Percentage of withholding tax |  | 10.00% | 10.00% |  |  |  |
Provision for withholding tax payable |  | ¥ 100,572 |  | ¥ 103,347 | $ 15,890 |  |
Yuchai [Member] | Jining Yuchai Engine Company Limited [Member] |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [Line Items] |  |  |  |  |  |  |
Acquisition of equity interest | 100.00% | 100.00% | 100.00% |  |  |  |
Bottom of range [Member] |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [Line Items] |  |  |  |  |  |  |
Cash flows derived from forecasts period |  | 8 years | 8 years |  |  |  |
Top of range [Member] |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [Line Items] |  |  |  |  |  |  |
Cash flows derived from forecasts period |  | 15 years | 15 years |  |  |  |

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