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Fixed Assets (Detail)
In Thousands, unless otherwise specified
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Dec. 31, 2012
Computer equipment
USD ($)
Dec. 31, 2012
Computer equipment
CNY
Dec. 31, 2011
Computer equipment
CNY
Dec. 31, 2012
Office building
USD ($)
Dec. 31, 2012
Office building
CNY
Dec. 31, 2011
Office building
CNY
Dec. 31, 2012
Office building related facility, machinery and equipment
USD ($)
Dec. 31, 2012
Office building related facility, machinery and equipment
CNY
Dec. 31, 2011
Office building related facility, machinery and equipment
CNY
Dec. 31, 2012
Vehicles
USD ($)
Dec. 31, 2012
Vehicles
CNY
Dec. 31, 2011
Vehicles
CNY
Dec. 31, 2012
Office equipment
USD ($)
Dec. 31, 2012
Office equipment
CNY
Dec. 31, 2011
Office equipment
CNY
Dec. 31, 2012
Leasehold improvements
USD ($)
Dec. 31, 2012
Leasehold improvements
CNY
Dec. 31, 2011
Leasehold improvements
CNY
Dec. 31, 2012
Construction in Progress
USD ($)
Dec. 31, 2012
Construction in Progress
CNY
Dec. 31, 2011
Construction in Progress
CNY
Property, Plant and Equipment [Line Items]                                                
Property, plant and equipment, gross $ 1,059,883 6,603,181 4,347,600 $ 798,238 4,973,104 3,450,160 $ 146,303 911,482 393,865 $ 25,078 156,240 137,209 $ 1,207 7,519 6,943 $ 34,087 212,368 177,509 $ 31,099 193,751 178,932 $ 23,871 148,717 2,982
Accumulated depreciation (435,836) (2,715,304) (1,653,600)                                          
Fixed assets, net $ 624,047 3,887,877 2,694,000