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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance ¥ 81,826,000      
Charge to consolidated statement of profit or loss 40,000,000 $ 6,320 ¥ 0 ¥ 26,700,000
Ending balance 10,122,000 $ 1,599 81,826,000  
Cost [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance     168,526,000  
Disposal (31,704,000)      
Ending balance 136,822,000     168,526,000
Accumulated impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance     ¥ 86,700,000  
Charge to consolidated statement of profit or loss 40,000,000      
Ending balance ¥ 126,700,000     ¥ 86,700,000