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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended
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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) |  |  |  |  |  |  |  |  |  |  |  |

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