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Business acquisition (Narrative) (Details)
¥ in Thousands
 1 Months Ended 12 Months Ended
Jul. 31, 2015
CNY (¥)
Dec. 31, 2015
CNY (¥)
item
Business acquisition [Line Items]    
Reduction of additional paid-in capital   ¥ 1,496
Travel agencies [Member]    
Business acquisition [Line Items]    
Number of offline travel agencies acquired | item   4
Total purchase price   ¥ 117,997
Cash consideration   102,662
Fair value of contingent cash consideration to be made based on the achievement of certain revenue and profit target   15,335
Total unpaid consideration   ¥ 39,471
Number of travel agencies, whose preliminary allocation of the purchase price was made | item   2
Travel agencies [Member] | Minimum [Member]    
Business acquisition [Line Items]    
Period used to measure achievement of certain revenue and profit target for contingent cash consideration payment   3 years
Travel agencies [Member] | Maximum [Member]    
Business acquisition [Line Items]    
Period used to measure achievement of certain revenue and profit target for contingent cash consideration payment   4 years
Offline travel agency, one [Member]    
Business acquisition [Line Items]    
Equity interests acquired   90.00%
Additional equity interests acquired   10.00%
Consideration transferred for acquisition of additional interest   ¥ 1,496
Reduction of additional paid-in capital   ¥ 683
Offline travel agency, two [Member]    
Business acquisition [Line Items]    
Equity interests acquired   100.00%
Offline travel agency, three [Member]    
Business acquisition [Line Items]    
Equity interests acquired   75.02%
Offline travel agency, four [Member]    
Business acquisition [Line Items]    
Equity interests acquired   80.00%
Other acquisition [Member]    
Business acquisition [Line Items]    
Equity interests acquired 100.00%  
Total purchase price ¥ 8,645  
Total unpaid consideration   ¥ 2,645