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Fixed Assets - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Property, Plant and Equipment [Line Items]        
Capital leases, asset gross $ 16.71 104.11 47.89  
Capital leases, accumulated depreciation 3.78 23.54 1.33  
Capital leases, future minimum lease payments   83.51    
Capital leases, future minimum lease payments due in 2013   36.79    
Capital leases, future minimum lease payments due in 2014   32.67    
Capital leases, future minimum lease payments due in 2015   13.91    
Capital leases, future minimum lease payments due in 2016   0.10    
Capital leases, future minimum lease payments due in 2017   0.04    
Fixed assets, depreciation expense $ 192.39 1,200.00 747.74 380.89