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Investment Property - Summary of Investment Property (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 detailed information about investment property [line items]        
Beginning balance [1]   ¥ 7,434    
Charge for the year $ 132 884 ¥ 248 [1] ¥ 248 [1]
Ending balance 1,011 6,765 7,434 [1]  
Consolidated statements of profit or loss:        
Rental income from an investment property 65 437 372  
Direct operating expenses (including repairs, maintenance and depreciation expense) arising from the rental generating property (47) (314) (508)  
Fair value [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance   10,557    
Ending balance 1,627 10,886 10,557  
Cost [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 4,924 32,944 31,776  
Translation difference 154 1,028 1,168  
Ending balance 5,078 33,972 32,944 31,776
Accumulated depreciation, amortization and impairment [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 3,813 25,510 24,478  
Charge for the year 132 884 248  
Translation difference 122 813 784  
Ending balance $ 4,067 ¥ 27,207 ¥ 25,510 ¥ 24,478
[1] Restated