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Commitments and contingencies (Narrative) (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Litigation [Line Items] |  |  |
Total office rental expenses | ¥ 76,753 | ¥ 53,674 | ¥ 28,144
Outstanding capital commitments | 144,301 |  |
Copyright infringement claim [Member] | NetEase [Member] |  |  |
Litigation [Line Items] |  |  |
Amount of potential damages sought | ¥ 100,000 |  |

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