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Business combination (Narrative) (Details) ¥ in Thousands, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2015 CNY (¥) | Dec. 23, 2014 CNY (¥) | Dec. 02, 2014 CNY (¥) | Feb. 28, 2015 | Dec. 31, 2015 USD ($) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2013 CNY (¥)
Business combination [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 23,409 | ¥ 300,382 | ¥ 151,638 | ¥ 1,577
Brand Name [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 10 years | 11 years |  |
Software [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  | 5 years | 4 years |  |
100 Online and DuBooker [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interests acquired |  |  | 100.00% |  |  |  |  |
Cash consideration |  |  | ¥ 60,000 |  |  |  |  |
Base contingent payment to be made when achieves specific percentage of performance metrics |  |  | 100.00% |  |  |  |  |
Maximum undiscounted amounts the Company could have paid under the contingent consideration provisions of the agreement |  |  | ¥ 240,000 |  |  |  |  |
Contingent consideration |  |  | 183,000 |  |  |  |  |
Goodwill |  |  | ¥ 195,893 |  |  |  |  |
100 Online and DuBooker [Member] | Cooperation Agreements [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |  |
100 Online and DuBooker [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  |  | 5 years |  |  |  |  |
100 Online and DuBooker [Member] | Copyrights of teaching material [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  |  | 5 years |  |  |  |  |
100 Online and DuBooker [Member] | Brand Name [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  |  | 9 years |  |  |  |  |
Xingxue and Chuangzhi [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interests acquired |  | 100.00% |  |  |  | 100.00% |  |
Cash consideration |  | ¥ 128,000 |  |  |  |  |  |
Goodwill |  | ¥ 100,382 |  |  |  |  |  |
Xingxue and Chuangzhi [Member] | Brand Name [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  | 15 years |  |  |  |  |  |
Xingxue and Chuangzhi [Member] | Software [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  | 5 years |  |  |  |  |  |
Beifu [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interests acquired | 70.00% |  |  | 70.00% |  |  |  |
Cash consideration | ¥ 39,200 |  |  |  |  |  |  |
Base contingent payment to be made when achieves specific percentage of performance metrics | 100.00% |  |  |  |  |  |  |
Maximum undiscounted amounts the Company could have paid under the contingent consideration provisions of the agreement | ¥ 219,000 |  |  |  |  |  |  |
Contingent consideration | 107,000 |  |  |  |  |  |  |
Goodwill | ¥ 147,388 |  |  |  |  |  |  |
Beifu [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  | 7 years |  |  |  |
Beifu [Member] | Online game hosts [Member] |  |  |  |  |  |  |  |
Business combination [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  | 3 years |  |  |  |

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