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Inventories - Summary of Analysis of Inventory Reserve Accounts (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Write-downs (reversals of write-downs) of inventories [abstract]        
Inventories recognized as an expense in cost of sales $ 1,714,771 ¥ 11,471,988 ¥ 11,021,960 ¥ 9,308,265
Inventories written down 3,766 25,194 17,492 48,202
Reversal of write-down of inventories $ (5,032) ¥ (33,662) ¥ (37,393) ¥ (53,373)