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Business combination and disposal of subsidiaries and businesses - Disposal of Beijing Yunke Online Technology Development Co., Ltd. (Details) - Beijing Yunke Online Technology Developments Co., Ltd. [Member] ¥ in Thousands	1 Months Ended
	Jan. 31, 2017 CNY (¥)
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%

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 230
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

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-Name Accounting Standards Codification
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