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Shipping and handling expenses - Summary of Sales Related Shipping and Handling Expenses Not Separately Billed to Customers (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Disclosure of income statement [line items] |  |  |  |
Shipping and handling expenses | ¥ 150,973 | $ 21,253 | ¥ 150,661 | ¥ 224,292
Cost of sales [member] |  |  |  |
Disclosure of income statement [line items] |  |  |  |
Shipping and handling expenses | 129,954 | 18,294 | 132,117 | 194,022
Selling, general and administrative expenses [member] |  |  |  |
Disclosure of income statement [line items] |  |  |  |
Shipping and handling expenses | ¥ 21,019 | $ 2,959 | ¥ 18,544 | ¥ 30,270

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