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Represents the exchange rate used for convenience translation from reporting currency to additional disclosures in another currency.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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Summary of significant accounting policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2015 CNY (¥)
Foreign currency translation
Exchange gains/(losses)	$ (8,860)	¥ (57,395,000)	¥ (28,980,000)	¥ 92,761,000
Foreign currency translation adjustments	$ 182,538	¥ 1,182,445,000	(121,612,000)	(137,921,000)
Convenience translation
Convenience translation rate (RMB to USD)	6.4778	6.4778
Short-term investments
Impairment losses related to short-term investments		¥ 0	0	¥ 0
Construction in progress
Amount of construction in progress	$ 195,590		¥ 1,928,899,000		¥ 1,266,992,000
Minimum
Loan receivables, net
Loan periods extended range	1 day	1 day
Maximum
Loan receivables, net
Loan periods extended range	6 months	6 months
Electronic equipment
Property, equipment and software, net
Estimated useful lives	3 years	3 years
Office equipment
Property, equipment and software, net
Estimated useful lives	5 years	5 years
Vehicles
Property, equipment and software, net
Estimated useful lives	5 years	5 years
Logistic and warehouse equipment
Property, equipment and software, net
Estimated useful lives	5 years	5 years
Leasehold improvement
Property, equipment and software, net
Estimated useful lives	Over the shorter of the expected life of leasehold improvements or the lease term	Over the shorter of the expected life of leasehold improvements or the lease term
Software \| Minimum
Property, equipment and software, net
Estimated useful lives	3 years	3 years
Software \| Maximum
Property, equipment and software, net
Estimated useful lives	5 years	5 years
Building
Property, equipment and software, net
Estimated useful lives	40 years	40 years
Building improvement \| Minimum
Property, equipment and software, net
Estimated useful lives	5 years	5 years
Building improvement \| Maximum
Property, equipment and software, net
Estimated useful lives	10 years	10 years