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Financial Risk Management Objectives and Policies - Additional Information (Detail) ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 CNY (¥) Customer | Dec. 31, 2021 USD ($) Customer | Dec. 31, 2020 CNY (¥) Customer | Dec. 31, 2021 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Basis points | 50.00% |  | 50.00% | 50.00%
Increase decrease in profit before tax on basis of higher lower basis points | ¥ 15.4 | $ 2.4 | ¥ 20.9 |
People's Republic of China [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Number of top customers | 20 | 20 | 20 |
People's Republic of China [member] | Top 20 Customers [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Amount owed | ¥ 398.5 |  | ¥ 125.5 | $ 63.0
Percentage of trade receivables excluding bills receivables | 63.40% | 63.40% | 37.70% |

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