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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) Customer Unit | Jun. 30, 2015 Unit | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) Unit | Dec. 31, 2013 CNY (¥) | Dec. 31, 2015 CNY (¥) Customer | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY (¥)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Internal use software development costs capitalized during the period |  |  | $ 5,050 | ¥ 32,730,000 | ¥ 0 | ¥ 2,680,000 |  |  |
Amortization expense for capitalized software costs |  |  | 2,040 | 13,240,000 | ¥ 28,240,000 | 31,650,000 |  |  |
Unamortized amount of capitalized internal use software developed costs (included in intangible assets, net) | $ 5,050 |  | 5,050 |  |  |  | ¥ 32,730,000 |  | ¥ 13,240,000
Number of reporting units the Company has | Unit | 3 | 4 |  |  | 3 |  |  |  |
Sale tax and surcharges in cost of revenues |  |  | 716,290 | 4,640,000,000 | ¥ 3,600,000,000 | 2,330,000,000 |  |  |
Advertising and promotional expenses |  |  | 1,510,000 | ¥ 9,800,000,000 | ¥ 4,930,000,000 | ¥ 2,110,000,000 |  |  |
Cash and cash equivalents, restricted cash and short-term investments | $ 10,790,000 |  | $ 10,790,000 |  |  |  | ¥ 69,900,000,000 |  |
Number of customers with receivable balance exceeding 10 % | Customer | 0 |  | 0 |  |  |  | 0 |  |
Number of customer or any Baidu Union member with revenue greater than 10% |  |  | 0 | 0 | 0 | 0 |  |  |
Appreciation of US$ against RMB, as a percentage |  |  | 4.40% | 4.40% |  |  |  |  |
ASU 2015-17 | Restatement Adjustment |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Deferred tax assets, gross, current |  |  |  |  |  |  |  | $ (105,740) | (684,950,000)
Deferred tax assets, gross, noncurrent |  |  |  |  |  |  |  | $ 105,740 | 684,950,000
Online Payment Agencies |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts of online payment agencies | ¥ |  |  |  |  |  |  | ¥ 0 |  | ¥ 0
Other Long-term Investments | Minimum |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalent and investments |  |  | 12 months | 12 months |  |  |  |  |
Cash and cash equivalents | Maximum |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalent and investments |  |  | 3 months | 3 months |  |  |  |  |
Short-term Investments | Minimum |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalent and investments |  |  | 3 months | 3 months |  |  |  |  |
Short-term Investments | Maximum |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Maturity period used to classify cash and cash equivalent and investments |  |  | 12 months | 12 months |  |  |  |  |
Credit Concentration Risk | Sales Revenue, Net | Maximum |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 10.00% | 10.00% |  |  |  |  |
Onshore China | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 95.30% | 95.30% |  |  |  |  |
Offshore China | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 4.70% | 4.70% |  |  |  |  |
China Merchants Bank | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 28.40% | 28.40% |  |  |  |  |
Bank of China | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 24.31% | 24.31% |  |  |  |  |
China Construction Bank [Member] | Credit Concentration Risk | Financial Instruments |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Concentration risk by percentage |  |  | 10.14% | 10.14% |  |  |  |  |
Office building and its related facility, machinery and equipment |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Property, plant and equipment, salvage value, percentage | 4.00% |  | 4.00% |  |  |  | 4.00% |  |
iQiyi Licensed Copyright |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Barter transaction, Gross Operating Revenue Recognized |  |  | $ 56,540 | ¥ 366,250,000 |  |  |  |  |
Barter transaction, Cost Recognized |  |  | $ 42,890 | ¥ 277,820,000 |  |  |  |  |

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