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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended
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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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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