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Inventories - Summary of Inventories (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Jan. 01, 2017
CNY (¥)
[1]
Classes of current inventories [abstract]        
Raw materials $ 185,940 ¥ 1,243,955 ¥ 1,188,396  
Work in progress 4,490 30,038 34,924  
Finished goods 185,927 1,243,871 1,349,425  
Total inventories at the lower of cost and net realizable value $ 376,357 ¥ 2,517,864 ¥ 2,572,745 [1] ¥ 1,663,879
[1] Restated