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v3.21.1

Basis of Preparation and Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 km Hours | Feb. 28, 2021
Disclosure of Summary of Significant Accounting Policies [Line items] |  |
Convenience translation exchange rate per US$1.00 |  | 6.4713
Estimated useful lives of the investment properties | 30 years |
Bottom of range [member] | On-Road Applications Engines [member] |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |
Warranty claim period | 3 months |
Warranty mileage | km | 3,000 |
Bottom of range [member] | Other Applications Engines [member] |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |
Warranty claim period | 3 months |
Product warranty running hours | Hours | 300 |
Top of range [member] | On-Road Applications Engines [member] |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |
Warranty claim period | 36 months |
Warranty mileage | km | 300,000 |
Top of range [member] | Other Applications Engines [member] |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |
Warranty claim period | 36 months |
Product warranty running hours | Hours | 4,000 |

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