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Inventories - Analysis of Inventory Reserve Accounts (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Write-downs (reversals of write-downs) of inventories [Abstract]        
Inventories recognized as an expense in cost of sales ¥ 11,021,960 $ 1,741,391 ¥ 9,308,265 ¥ 9,566,699
Inventories written down 17,492 2,764 48,202 59,339
Reversal of write-down of inventories ¥ (37,393) $ (5,908) ¥ (53,373) ¥ (24,079)