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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Dec. 31, 2009
CNY
Dec. 31, 2011
Office building and its related facility, machinery and equipment
Dec. 31, 2011
Computer equipment
USD ($)
Dec. 31, 2011
Internal use software development costs
USD ($)
Dec. 31, 2011
Office equipment
USD ($)
Dec. 31, 2011
Vehicles
USD ($)
Dec. 31, 2011
Leasehold improvements
USD ($)
Dec. 31, 2011
Depreciation of Entity Functional Currency USD Against Reporting Currency RMB
Dec. 31, 2011
Appreciation of Subsidiaries in Japans Functional Currency JPY Against Reporting Currency RMB
Dec. 31, 2011
Maximum
Dec. 31, 2011
Cash and cash equivalents
Maximum
Dec. 31, 2011
Short-term Investments
Maximum
Dec. 31, 2011
Short-term Investments
Minimum
Summary Of Significant Accounting Policies [Line Items]                                
Number of operating segment 1 1                            
Number of reporting units to determine whether further impairment testing on goodwill was necessary 1 1                            
Number of reporting units the Company has subsequent to the acquisition of Qunar 2 2                            
Maturity period used to classify investments                           3 months 12 months 3 months
Internal use software development costs capitalized during the period $ 7,030,000 44,260,000 10,380,000 12,590,000                        
Amortization expense for capitalized software costs 1,190,000 7,510,000 8,860,000 9,770,000                        
Unamortized amount of capitalized internal use software developed costs (included in fixed assets, net) 8,270,000 52,040,000 15,280,000                          
Business tax and surcharges in cost of revenues 160,000,000 1,020,000,000 504,850,000 275,920,000                        
Advertising expenses 24,960,000 157,100,000 74,760,000 77,800,000                        
Financial subsidies received 11,880,000 74,760,000 49,140,000 42,500,000                        
Property, plant and equipment, salvage value, percentage         4.00%                      
Property, plant, and equipment, salvage value           0 0 0 0 0            
Cash and cash equivalents, restricted cash and short-term investments 2,330,000,000 14,660,000,000                            
Cash, bank deposits and money market funds in the PRC 2,240,000,000 14,070,000,000                            
Ratio of cash, bank deposits and money market funds in the PRC to total cash and cash equivalents and short-term investments 99.22% 99.22%                            
Percentage of cash and cash equivalents held at a single financial institution                         42.00%      
Threshold of business risk associated with amount 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                     (4.64%) 1.24%        
Net foreign currency translation gain or loss recorded in other comprehensive income $ 5,233,000 32,930,000 (3,865,000) (3,961,000)