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Basis of Preparation and Accounting Policies - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 CNY (¥) km | Dec. 31, 2017 USD ($) km | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Feb. 28, 2018 | Dec. 31, 2017 USD ($) | Jan. 01, 2017 CNY (¥) | Jan. 01, 2017 USD ($)
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Convenience translation exchange rate per US$1.00 |  |  |  |  | 6.3294 |  |  |
Estimated useful lives of the investment properties | 30 years | 30 years |  |  |  |  |  |
Research and development subsidies | ¥ 60,817 | $ 9,609 | ¥ 26,815 |  |  |  |  |
Percentage of shareholder interest | 7.70% | 7.70% |  |  |  |  |  |
Expected change in trade and other receivables arising from change in measurement attribute, initial application of IFRS 9 | ¥ 137,300 |  |  |  |  | $ 21,700 |  |
Expected change in equity arising from change in measurement attribute, initial application of IFRS 9 | 137,300 |  |  |  |  | 21,700 |  |
Selling and distribution expenses | 1,815,853 | $ 286,892 | 1,504,360 | ¥ 1,497,774 |  |  |  |
Revenue | 16,222,442 | 2,563,030 | 13,664,840 | 13,733,437 |  |  |  |
Cost of sales | 12,707,419 | 2,007,681 | 10,700,655 | 10,942,865 |  |  |  |
Expected change in retained earnings arising from change in measurement attribute, initial application of IFRS 15 |  |  |  |  |  |  | ¥ 83,900 | $ 13,300
Other operating income | 647,352 | 102,276 | ¥ 117,954 | ¥ 106,931 |  |  |  |
Warranty obligation [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Expected change in retained earnings arising from change in measurement attribute, initial application of IFRS 15 |  |  |  |  |  |  | ¥ (5,300) | $ (800)
Performance obligation [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Expected change in retained earnings arising from change in measurement attribute, initial application of IFRS 15 | 89,200 |  |  |  |  | 14,100 |  |
Increase (decrease) due to application of IFRS 15 [member] | Warranty obligation [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Selling and distribution expenses | (195,900) | (31,000) |  |  |  |  |  |
Revenue | (21,100) | (3,300) |  |  |  |  |  |
Cost of sales | 176,800 | 27,900 |  |  |  |  |  |
Provision for product warranty | (19,100) |  |  |  |  | (3,100) |  |
Contract liability | 21,100 |  |  |  |  | $ 3,300 |  |
Increase (decrease) due to application of IFRS 15 [member] | Performance obligation [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Other operating income | (115,200) | (18,200) |  |  |  |  |  |
Reversal of income tax expense | 26,000 | 4,100 |  |  |  |  |  |
IAS 18 [member] | Performance obligation [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Gain on sale of intangible asset | ¥ 115,200 | $ 18,200 |  |  |  |  |  |
Bottom of range [Member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Lease term | 15 years | 15 years |  |  |  |  |  |
Bottom of range [Member] | On-Road Applications Engines [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Warranty claim period | 3 months | 3 months |  |  |  |  |  |
Warranty mileage | 20,000 | 20,000 |  |  |  |  |  |
Bottom of range [Member] | Other Applications Engines [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Warranty claim period | 12 months | 12 months |  |  |  |  |  |
Top of range [Member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Lease term | 50 years | 50 years |  |  |  |  |  |
Top of range [Member] | On-Road Applications Engines [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Warranty claim period | 36 months | 36 months |  |  |  |  |  |
Warranty mileage | 300,000 | 300,000 |  |  |  |  |  |
Top of range [Member] | Other Applications Engines [member] |  |  |  |  |  |  |  |
Disclosure of Summary of Significant Accounting Policies [Line items] |  |  |  |  |  |  |  |
Warranty claim period | 24 months | 24 months |  |  |  |  |  |

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