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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) |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Appreciation or depreciation of functional currency of entity and its subsidiaries and VIEs against reporting currency by percentage. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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