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Property and Equipment and Related Accumulated Depreciation (Detail)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Property, Plant and Equipment [Line Items]      
Computer equipment $ 50,873,932 320,195,440 276,843,360
Leasehold improvements 343,121 2,159,574 927,186
Furniture and fixtures 3,421,518 21,534,695 18,449,740
Motor vehicles 741,845 4,669,096 4,669,096
Property 33,603,629 211,497,878  
Property, Plant and Equipment, Gross, Total 88,984,045 560,056,683 300,889,382
Less: Accumulated depreciation (33,427,410) (210,388,776) (157,603,079)
Property and equipment, net $ 55,556,635 349,667,907 143,286,303