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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Dec. 31, 2012
Depreciation of Entity Functional Currency USD Against Reporting Currency RMB
Dec. 31, 2012
Depreciation of Subsidiaries in Japan Functional Currency JPY Against Reporting Currency RMB
Dec. 31, 2012
Office building and its related facility, machinery and equipment
Dec. 31, 2012
Republic of China
Dec. 31, 2012
Non Republic of China
Dec. 31, 2012
Bank of China
Dec. 31, 2012
Morgan Stanley
Dec. 31, 2012
Maximum
Dec. 31, 2012
Cash and cash equivalents
Maximum
Dec. 31, 2012
Short-term Investments
Maximum
Dec. 31, 2012
Short-term Investments
Minimum
Dec. 31, 2012
Long Term Investments
Minimum
Summary Of Significant Accounting Policies [Line Items]                                
Number of operating segment 1 1                            
Maturity period used to classify cash and cash equivalent and investments                         3 months 12 months 3 months 12 months
Fair value long-term notes payable $ 1,512,060,000 9,420,285,000                            
Internal use software development costs capitalized during the period 6,120,000 38,130,000 44,260,000 10,380,000                        
Amortization expense for capitalized software costs 3,170,000 19,720,000 7,510,000 8,860,000                        
Unamortized amount of capitalized internal use software developed costs (included in intangible assets, net) 11,310,000 70,450,000 52,040,000                          
Property, plant and equipment, salvage value, percentage             4.00%                  
Number of reporting units the Company has 3 3 2 1                        
Sale tax and surcharges in cost of revenues 250,000,000 1,570,000,000 1,020,000,000 504,850,000                        
Advertising expenses 52,460,000 326,830,000 157,100,000 74,760,000                        
Cash and cash equivalents, restricted cash and short-term investments 5,280,000,000 32,880,000,000                            
Percentage of cash and cash equivalents, restricted cash and short-term investments held by financial institutions in the PRC and outside of the PRC               72.98% 27.02%              
Percentage of cash and cash equivalents, restricted cash and short-term investments held at a single financial institution                   14.71% 13.32%          
Threshold of business risk associated with percentage of revenue generated by any single customer or union member of company                       10.00%        
Appreciation or depreciation of functional currency of entity and its subsidiaries and VIEs against reporting currency by percentage         1.01% 12.10%                    
Net foreign currency translation gain or loss recorded in other comprehensive income $ (850,000) (5,270,000) 32,930,000 (3,870,000)