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Financial Risk Management Objectives and Policies - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Customer
Dec. 31, 2017
USD ($)
Customer
Dec. 31, 2016
CNY (¥)
Customer
Dec. 31, 2017
USD ($)
Disclosure of detailed information about financial instruments [Line Items]        
Basis points 0.50%   0.50% 0.50%
Increase decrease in profit before tax on basis of higher lower basis points ¥ 22,015 $ 3,478 ¥ 15,712  
Customers with Trade Receivable Balances Over Threshold [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Percentage of trade receivables excluding bills receivables 73.80% 73.80% 79.60%  
Number of major customers 44 44 38  
Threshold of trade receivables excluding bills receivables defining major customer ¥ 1,000 $ 158    
People's Republic of China [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Number of top customers 20 20 20  
People's Republic of China [Member] | Top 20 Customers [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Amount owed ¥ 57,220   ¥ 151,033 $ 9,040
Percentage of trade receivables excluding bills receivables 22.40% 22.40% 51.10%