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Reserves - Summary of Other Components of Equity (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Jan. 01, 2017
CNY (¥)
 [1]
Disclosure of other components of equity [line items]        
Other components of equity $ 16,584 ¥ 110,946 ¥ 74,722 [1] ¥ 11,560
Foreign currency translation reserve [member]        
Disclosure of other components of equity [line items]        
Other components of equity (5,862) (39,215) (82,939)  
Performance shares reserves [member]        
Disclosure of other components of equity [line items]        
Other components of equity 2,953 19,758 19,758  
Premium paid for acquisition of non-controlling interests [member]        
Disclosure of other components of equity [line items]        
Other components of equity (1,725) (11,541) ¥ (11,541)  
Reserve of gains and losses on financial assets measured at fair value through other comprehensive income [member]        
Disclosure of other components of equity [line items]        
Other components of equity $ (11,950) ¥ (79,948)    
[1] Restated