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Related Party Disclosures - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2015
CNY (¥)
Hong Leong Asia Limited [Member] | Subsidiaries [Member]        
Disclosure of transactions between related parties [Line Items]        
Ownership interest in the entity, percentage 40.00% 40.00% 40.20%  
Ownership interest in the entity, shares 16,360,845 16,360,845 16,360,845  
Number of special shares held, entitles to elect majority of board of directors 1 1 1  
Consultancy fees charged ¥ 34 $ 5 ¥ 34 ¥ 32
HL Technology Systems Private Limited [Member] | Subsidiaries [Member]        
Disclosure of transactions between related parties [Line Items]        
Ownership interest held by controlling shareholder, percent 23.30% 23.30% 23.40%  
Well Summit Investments Limited [Member] | Subsidiaries [Member]        
Disclosure of transactions between related parties [Line Items]        
Ownership interest held by controlling shareholder, percent 16.70% 16.70% 16.80%  
Yulin City Government [Member]        
Disclosure of transactions between related parties [Line Items]        
Ownership interest held by non-controlling shareholder with significant influence over the Group 17.20% 17.20% 17.30%