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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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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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