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Commitments and contingencies (Narrative) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Litigation [Line Items]
Total office rental expenses	¥ 50,206	¥ 62,211	¥ 76,753
Outstanding capital commitments	193,412	111,966
Copyright infringement claim [Member]
Litigation [Line Items]
Loss Contingency, Damages Sought, Value	20,000	20,000	100,000
Copyright infringement claim [Member] | NetEase [Member]
Litigation [Line Items]
Loss Contingency, Damages Sought, Value	¥ 20,000	¥ 20,000	¥ 100,000

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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