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Restricted net assets (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Percentage of after-tax income required to be transferred to statutory general reserve fund	10.00%
Reserve level threshold for mandatory appropriation requirement (as a percent)	50.00%
Restricted net assets	¥ 5,057,086	¥ 3,559,861

X

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e)(3)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the percentage of after-tax income required to be appropriated towards the general reserve fund for the entity's subsidiaries and the VIEs and VIE''s subsidiary.

+ References

No definition available.

+ Details

Name:	yy_AppropriationOfAfterTaxIncomeToStatutoryGeneralReservePerAnnum
Namespace Prefix:	yy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the level of the general reserve fund balance as a percentage of registered capital for the entity's subsidiaries and the VIEs and VIE''s subsidiary in the PRC, which must be attained before mandatory transfers to the reserve are no longer required.

+ References

No definition available.

+ Details

Name:	yy_ReserveLevelThresholdForMandatoryTransferPercentage
Namespace Prefix:	yy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant