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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Segment
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Dec. 31, 2012
USD ($)
Dec. 31, 2010
CNY
Dec. 31, 2013
Online Payment Agencies
CNY
Dec. 31, 2012
Online Payment Agencies
CNY
Dec. 31, 2013
Cash and cash equivalents
Maximum
Dec. 31, 2013
Short-term Investments
Minimum
Dec. 31, 2013
Short-term Investments
Maximum
Dec. 31, 2013
Other Long-term Investments
Minimum
Dec. 31, 2013
Office building and its related facility, machinery and equipment
Dec. 31, 2013
Credit Concentration Risk
Sales Revenue, Net
Maximum
Dec. 31, 2013
Onshore China
Credit Concentration Risk
Financial Instruments
Dec. 31, 2013
Offshore China
Credit Concentration Risk
Financial Instruments
Dec. 31, 2013
Bank of China
Credit Concentration Risk
Financial Instruments
Dec. 31, 2013
Morgan Stanley
Credit Concentration Risk
Financial Instruments
Accounting Policies [Abstract]                                    
Number of operating segment 1 1                                
Maturity period used to classify cash and cash equivalent and investments                 3 months 3 months 12 months 12 months            
Allowance for doubtful accounts $ 7,237,000 43,814,000 5,768,000 5,806,000 $ 953,000 2,223,000 0 0                    
Fair value long-term notes payable 2,444,445,000 14,797,937,000 9,420,285,000                              
Internal use software development costs capitalized during the period 440,000 2,680,000 38,130,000 44,260,000                            
Amortization expense for capitalized software costs 5,230,000 31,650,000 19,720,000 7,510,000                            
Unamortized amount of capitalized internal use software developed costs (included in intangible assets, net) 6,850,000 41,480,000 70,450,000                              
Property, plant and equipment, salvage value, percentage                         4.00%          
Number of reporting units the Company has 3 3 3                              
Sale tax and surcharges in cost of revenues 384,820,000 2,330,000,000 1,570,000,000 1,020,000,000                            
Advertising expenses 31,650,000 191,610,000 326,830,000 157,100,000                            
Unrecognized tax benefits or interest and penalties   0 0 0                            
Cash and cash equivalents, restricted cash and short-term investments $ 6,390,000,000 38,690,000,000                                
Concentration risk by percentage                           10.00% 89.16% 10.84% 22.97% 3.36%
Depreciation of US$ against RMB, as a percentage 2.83% 2.83%