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Principal Accounting Policies - Principles of Consolidation (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2014
CNY (¥)
Sep. 17, 2008
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Feb. 28, 2021
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jan. 01, 2020
CNY (¥)
Jan. 12, 2018
USD ($)
Principles of Consolidation [Line Items]                      
Accumulated deficit     ¥ (7,713,355)   ¥ (6,385,974)     $ (1,182,123)      
Cash and cash equivalents and short-term investments     1,567,208                
Stock Repurchase Program, Authorized Amount | $                 $ 10,000   $ 100,000
Revenues     450,259 $ 69,006 2,280,987 ¥ 2,240,149          
Accounting standards update                      
Principles of Consolidation [Line Items]                      
Accumulated deficit                   ¥ 19,425  
The Affiliated Entities [Member]                      
Principles of Consolidation [Line Items]                      
Accumulated deficit     4,617                
Revenues     485,702 $ 74,437 1,181,747 1,524,924          
Consolidated affiliated entities [Member] | Cooperation Agreement [Member] | Others [Member]                      
Principles of Consolidation [Line Items]                      
Revenues     ¥ 12,813   ¥ 30,420 ¥ 197,853          
Nanjing Tuniu [Member] | Purchase Option Agreement [Member] | Beijing Tuniu [Member]                      
Principles of Consolidation [Line Items]                      
Value of equity interest ¥ 2,430 ¥ 1,800                  
Equity interest purchase option term   10 years                  
Nanjing Tuniu [Member] | Cooperation Agreement [Member] | Beijing Tuniu [Member]                      
Principles of Consolidation [Line Items]                      
Monthly service fees as percentage of profits from agreement     100.00% 100.00%              
Number of consecutive years of not able to provide technology consulting and services as the agreement     3 years 3 years              
Nanjing Tuniu [Member] | Anqiang Chen [Member] | Subsequent Event [Member]                      
Principles of Consolidation [Line Items]                      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners             19.11%        
Nanjing Tuniu [Member] | Dunde Yu | Subsequent Event [Member]                      
Principles of Consolidation [Line Items]                      
Equity interest (in percetage)             80.89%