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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)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
PRC Statutory income tax rate (as a percent)		(25.00%)	(25.00%)	(25.00%)
Effect of preferential tax rate (as a percent)		11.60%	14.00%	13.10%
Effect of tax-exempt entities (as a percent)		(1.70%)	(1.60%)	1.10%
Effect of change in tax rate (as a percent)	[1]		0.50%
Permanent differences (as a percent)		(1.10%)	(3.80%)	(3.50%)
Change in valuation allowance (as a percent)		(1.50%)	(1.70%)	(0.40%)
Effect of Super Deduction available to the Group (as a percent)		2.00%	2.30%	2.00%
Effective income tax rate (as a percent)		(15.70%)	(15.30%)	(12.70%)
[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.

X

- 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 changes in the income tax rates.

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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 deduction for qualified production activity.

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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 equity-based compensation costs.

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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 income (loss) exempt from income taxes.

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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 preferential tax.

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