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Taxation (Details 3) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
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) 24.70% 1.90% 1.70%    
Tax effect of tax-exempt entities (as a percent) (21.20%) (10.90%) (22.40%)    
Effect on tax rates in different tax jurisdiction (as a percent) (2.20%) (0.20%) 0.10%    
Tax effect of non-deductible expenses (as a percent) (18.90%) (10.90%) (3.40%)    
Tax effect of non-taxable income (as a percent) 0.00% 0.20% 1.10%    
Changes in valuation allowance (as a percent) (12.90%) (4.50%) (0.50%)    
Expiration of loss carry forwards (as a percent) 0.00% (0.40%) (2.00%)    
Effective tax rates (as a percent) (5.50%) 0.20% (0.40%)    
Deferred tax assets          
Allowance for doubtful accounts       ¥ 228,965 ¥ 79,136
Deferred revenues, accruals and other liabilities       212,504 66,027
Net operating loss carry forwards       1,336,035 1,215,975
Less: valuation allowance ¥ (1,361,138) ¥ (931,458) ¥ (905,833) (1,777,504) (1,361,138)
Net deferred tax assets       0 0
Deferred tax liabilities          
Intangible assets arisen from business combination       907,356 1,228
Total deferred tax liabilities       907,356 ¥ 1,228
Net operating loss carry forwards       ¥ 6,160,815  
Movement of valuation allowance          
Balance at beginning of the period 1,361,138 931,458 905,833    
Additions 633,457 449,381 156,820    
Reversals (217,091) (19,701) (131,195)    
Balance at end of the period ¥ 1,777,504 ¥ 1,361,138 ¥ 931,458