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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Other Operating Expenses (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Profit or loss [Abstract]        
Loss on disposal of property, plant and equipment     ¥ 14,020 ¥ 14,874
Loss on disposal of subsidiary       13,647
Loss on dilution of equity interest in joint venture       2,848
Foreign exchange loss, net     4,006 45,354
Fair value loss on held for trading investment     243 10,871
Fair value loss on foreign exchange forward contract     140  
Goodwill written off     1,131  
Others ¥ 22,719 $ 3,589 3,059  
Other operating expenses ¥ 22,719 $ 3,589 ¥ 22,599 ¥ 87,594