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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Other Operating Income (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Disclosure Of Information On Income Statement [line items]        
Interest income $ 22,009 ¥ 147,244 ¥ 105,421 ¥ 56,983
Dividend income from quoted equity securities 298 1,992 2,532 [1] 943 [1]
Gain on disposal of joint venture   107,976 [1]  
Gain on disposal of property, plant and equipment 1,321 8,835    
Government grants 4,819 32,237   41,515
Fair value gain on foreign exchange forward contract 677 4,529    
Write-back of trade and other payables   29 [1]  
Foreign exchange gain, net 160 1,071    
Others 1,379 9,235   18,513
Other operating income $ 30,663 ¥ 205,143 532,117 [1] ¥ 117,954 [1]
Restated [member]        
Disclosure Of Information On Income Statement [line items]        
Interest income     105,421  
Dividend income from quoted equity securities     2,532  
Gain on disposal of associate     199  
Gain on disposal of joint venture     107,976  
Gain on disposal of property, plant and equipment     11,668  
Gain on disposal of subsidiaries     216,115  
Government grants     34,337  
Fair value gain on quoted equity securities     12,768  
Write-back of trade and other payables     29  
Foreign exchange gain, net     30,943  
Others     10,129  
Other operating income     ¥ 532,117  
[1] Restated