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Inventories - Summary of Inventories (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Classes of current inventories [abstract]      
Raw materials ¥ 2,111,881 $ 334,042 ¥ 1,940,119
Work in progress 25,169 3,981 33,211
Finished goods 3,071,586 485,841 2,497,865
Total inventories at the lower of cost and net realizable value ¥ 5,208,636 $ 823,864 ¥ 4,471,195