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Business combination and disposal of subsidiaries (Narrative) (Details) - CNY (¥)
¥ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2017
Jun. 30, 2016
Dec. 31, 2016
Beijing Yunke Online Technology Developments Co., Ltd. [Member]      
Business combination [Line Items]      
Gain (Loss) on Disposition of Stock in Subsidiary ¥ 37,989    
Disposal Of Equity Interest, Percentage Of Ownership Transferred 46.00%    
Sale of Stock, Percentage of Ownership after Transaction 34.00%    
Xingxue Technology Development Co., Ltd [Member]      
Business combination [Line Items]      
Equity Method Investment Disposal Percentage     33.86%
Assets and Liabilities for Disposal of Subsidiaries     ¥ 154,999
Proceeds from Sale of Equity Method Investments     ¥ 118,500
Equity Method Investment, Ownership Percentage     31.14%
Equity Method Investment, Realized Gain (Loss) on Disposal     ¥ 127,434
Deconsolidation, Revaluation of Retained Investment, Gain (Loss), Amount     57,791
Fair value of consideration received, fair value the retained noncontrolling interest and carrying amount of noncontrolling interest     ¥ 282,433
Beifu [Member]      
Business combination [Line Items]      
Subsidiary Divestiture Interest Percentage   60.00%  
Proceeds from Divestiture of Interest in Consolidated Subsidiaries   ¥ 3,500  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   10.00%  
Gain (Loss) on Disposition of Stock in Subsidiary   ¥ (23,474)  
Fair Value Consideration Received   13,236  
Assets and Liabilities for Disposal of Subsidiaries   36,710  
Deconsolidation, Revaluation of Retained Investment, Gain (Loss), Amount   ¥ (3,088)