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Income tax (Schedule of Reconciliation of Total Tax Expense Computed by Applying Respective Statutory Income Tax Rate to Pre-tax Income) (Details) - ¥ / shares		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
PRC Statutory income tax rate (as a percent)		(25.00%)	(25.00%)	(25.00%)
Effect of tax holiday and preferential tax rate benefit (as a percent)		16.50%	13.20%	11.60%
Effect of different tax rates available to different jurisdictions (as a percent)		(10.10%)	(0.30%)	(1.70%)
Permanent differences (as a percent)	[1]	(3.50%)	(1.80%)	(1.10%)
Change in valuation allowance (as a percent)		(1.60%)	(2.30%)	(1.50%)
Effect of Super Deduction available to the Group (as a percent)		4.90%	1.80%	2.00%
Effective income tax rate (as a percent)		(18.80%)	(14.40%)	(15.70%)
Per share effect of tax holiday (RMB)		¥ 0.27	¥ 0.24	¥ 0.18
ADS [Member]
Per share effect of tax holiday (RMB)		¥ 5.35	¥ 4.71	¥ 3.52
[1] Permanent differences mainly arise from expenses not deductible for tax purposes including primarily share-based compensation costs and expenses incurred by subsidiaries and VIEs.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

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Effective income tax rate reconciliation, effect of different tax rates available to different jurisdictions.

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