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Inventories - Summary of Inventories (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Classes of current inventories [abstract]      
Raw materials ¥ 1,940,119 $ 299,804 ¥ 1,500,034
Work in progress 33,211 5,132 35,688
Finished goods 2,497,865 385,991 1,288,415
Total inventories at the lower of cost and net realizable value ¥ 4,471,195 $ 690,927 ¥ 2,824,137