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Principal accounting policies (Sales and Marketing Expenses, Share based Compensation, Statutory Reserves, Dividends and Segment Reporting - Narrative) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statutory reserves [Line Item]
Advertising and market promotion expenses	¥ 1,065,866	¥ 621,771	¥ 298,681
Employee social security and welfare benefits	¥ 286,139	214,848	206,704
Minimum percentage appropriation to statutory surplus fund required	10.00%
Surplus fund threshold for mandatory appropriation requirement (as a percent)	50.00%
Amount appropriated to statutory reserves	¥ 0	0	0
Statutory reserves [Member]
Statutory reserves [Line Item]
Amount appropriated to statutory reserves	¥ 39,007	¥ 3,861	¥ 2,350

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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- Definition

Represents Statutory reserves appropriated during the period.

+ References

No definition available.

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- Definition

Represents the minimum percentage of after-tax profit required to be appropriated towards the statutory surplus fund for the entities incorporated in the People's Republic Of China until the reserve balance reaches 50 percent of registered capital.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Represents the level of the statutory surplus fund balance as a percentage of registered capital for the entities incorporated in the People's Republic of China, which must be attained before mandatory transfers to the fund are no longer required.

+ References

No definition available.

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