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Taxation (Details 3) - CNY (¥)
¥ / shares in Units, ¥ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of differences between statutory tax rate and effective tax rate          
Statutory income tax rate (as a percent) 25.00% 25.00% 25.00%    
Tax effect of preferential tax treatments (as a percent) (942.70%) 45.30% 1.00%    
Tax effect of tax-exempt entities (as a percent) 588.60% (36.10%) (13.50%)    
Effect on tax rates in different tax jurisdiction (as a percent) 30.50% (3.60%) (0.30%)    
Tax effect of non-deductible expenses (as a percent) 536.00% (28.10%) (10.80%)    
Tax effect of non-taxable income (as a percent) (14.00%) 0.10% 0.20%    
Changes in valuation allowance (as a percent) (120.80%) (11.40%) (0.90%)    
Expiration of loss carry forwards (as a percent) 12.80% 0.00% (0.50%)    
Effective tax rates (as a percent) 115.40% (8.80%) 0.20%    
Effect of tax holiday          
Tax holiday effect ¥ 1,140,251 ¥ 852,776 ¥ 80,892    
Effect of tax holiday on basic net loss per share ¥ 0.40 ¥ 0.30 ¥ 0.03    
Effect of tax holiday on diluted net loss per share ¥ 0.39 ¥ 0.30 ¥ 0.03    
Deferred tax assets          
Allowance for doubtful accounts       ¥ 52,117 ¥ 54,116
Deferred revenues       299,723 186,291
Net operating loss carry forwards       1,286,980 1,386,273
Less: valuation allowance ¥ (1,626,680) ¥ (1,299,200) ¥ (931,458) (1,480,570) (1,626,680)
Net deferred tax assets       158,250  
Deferred tax liabilities          
Intangible assets arisen from business combination       882,248 907,356
Total deferred tax liabilities       882,248 ¥ 907,356
Net operating loss carry forwards       ¥ 5,159,379  
Movement of valuation allowance          
Balance at beginning of the period 1,626,680 1,299,200 931,458    
Additions 807,558 1,324,793 1,148,265    
Reversals (953,668) (997,313) (780,523)    
Balance at end of the period ¥ 1,480,570 ¥ 1,626,680 ¥ 1,299,200