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Inventories - Summary of Inventories (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Classes of current inventories [Abstract]      
Raw materials ¥ 1,188,396 $ 187,758 ¥ 904,737
Work in progress 34,924 5,518 26,807
Finished goods 1,349,425 213,199 732,335
Total inventories at the lower of cost and net realizable value ¥ 2,572,745 $ 406,475 ¥ 1,663,879