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Assets, Liabilities and Results of Operations of VIEs and Their Subsidiaries Included in Company's Consolidated Balance Sheets and Statements of Comprehensive Income (Detail)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Dec. 31, 2009
CNY
Dec. 31, 2011
Variable Interest Entity, Primary Beneficiary
USD ($)
Dec. 31, 2011
Variable Interest Entity, Primary Beneficiary
CNY
Dec. 31, 2010
Variable Interest Entity, Primary Beneficiary
CNY
Dec. 31, 2009
Variable Interest Entity, Primary Beneficiary
CNY
Variable Interest Entity [Line Items]                
Total assets $ 3,708,439 23,340,541 11,048,439   $ 287,387 1,808,784 1,194,045  
current 2,518,019 15,848,156 8,782,447   160,257 1,008,640 564,729  
non-current 1,190,420 7,492,385 2,265,992   127,130 800,144 629,316  
Total liabilities 1,114,576 7,015,028 2,642,847   231,387 1,456,328 852,945  
current 700,130 4,406,547 2,551,847   213,265 1,342,268 766,945  
non-current 414,446 2,608,481 91,000   18,122 114,060 86,000  
Total revenues 2,303,943 14,500,786 7,915,074 4,447,776 668,159 4,205,327 1,832,629 934,814
Net income $ 1,051,862 6,620,318 3,525,168 1,485,104 $ 18,954 119,294 46,234 27,263