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Organization, Consolidation and Presentation of Financial Statements - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 30, 2016
Variable Interest Entity [Line Items]      
Net liabilities of VIEs $ 16,490 ¥ 114,500  
Creditors of the VIEs'third-party liabilities with no recourse to the general credit of the primary beneficiaries No    
Exchange rate used for conversion of financial statements from RMB to US dollar     6.9430
Beijing Perusal      
Variable Interest Entity [Line Items]      
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities $ 460,450 3,200,000  
Equity pledge agreement expiration period 2 years    
Baidu Pay      
Variable Interest Entity [Line Items]      
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities $ 31,210 216,720  
Equity pledge agreement expiration period 2 years    
Baidu Netcom      
Variable Interest Entity [Line Items]      
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities $ 128,190 ¥ 890,000  
Equity pledge agreement expiration period 2 years