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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Customer Unit | Dec. 31, 2016 CNY (¥) Customer Unit | Dec. 31, 2015 CNY (¥) Customer | Dec. 31, 2014 CNY (¥) Customer | Dec. 31, 2016 CNY (¥) Customer
Accounting Policies [Abstract] |  |  |  |  |
Internal use software development costs capitalized during the period | $ 579,260 | ¥ 4,020,000 | ¥ 32,730,000 | ¥ 0 |
Amortization expense for capitalized software costs | 970,520 | ¥ 6,740,000 | 13,240,000 | 28,240,000 |
Unamortized amount of capitalized internal use software developed costs (included in intangible assets, net) | $ 4,320,000 |  | 32,730,000 |  | ¥ 30,010,000
Number of reporting units | Unit | 3 | 3 |  |  |
Sale tax and surcharges in cost of revenues | $ 679,600,000 | ¥ 4,720,000,000 | 4,640,000,000 | 3,600,000,000 |
Advertising and promotional expenses | 1,120,000,000 | ¥ 7,740,000,000 | ¥ 9,800,000,000 | ¥ 4,930,000,000 |
Cash and cash equivalents, restricted cash and short-term investments | $ 12,990,000,000 |  |  |  | ¥ 90,160,000,000
Number of customers with receivable balance exceeding 10 % | 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 | 7.18% | 7.18% |  |  |
Online Payment Agencies |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Allowance for doubtful accounts of online payment agencies | ¥ |  |  | ¥ 0 |  | ¥ 0
Micro loans | Minimum |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Periods of loan granted | 1 month | 1 month |  |  |
Micro loans | Maximum |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Periods of loan granted | 36 months | 36 months |  |  |
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 | 90.22% | 90.22% |  |  |
Offshore China | Credit Concentration Risk | Financial Instruments |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Concentration risk by percentage | 9.78% | 9.78% |  |  |
China Merchants Bank | Credit Concentration Risk | Financial Instruments |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Concentration risk by percentage | 33.79% | 33.79% |  |  |
Bank of China | Credit Concentration Risk | Financial Instruments |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Concentration risk by percentage | 19.53% | 19.53% |  |  |
China Construction Bank [Member] | Credit Concentration Risk | Financial Instruments |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Concentration risk by percentage | 16.40% | 16.40% |  |  |
Office building related facility, machinery and equipment |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Property, plant and equipment, salvage value, percentage | 4.00% |  |  |  | 4.00%
iQiyi Licensed Copyright |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |
Barter transaction, Gross Operating Revenue Recognized | $ 61,040,000 | ¥ 423,800,000 | 366,250,000 |  |
Barter transaction, Cost Recognized | $ 53,180,000 | ¥ 369,240,000 | ¥ 277,820,000 |  |

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