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Intangible assets, net (Schedule of Weighted Average Amortization Periods of Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Domain names [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	15 years	15 years
Technology [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	5 years	5 years
Software [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	5 years	5 years
Software [Member] | Minimum [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	3 years
Software [Member] | Maximum [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	5 years
Operating rights for licensed games [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	2 years	3 years
Operating rights for game broadcasting [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	1 year	1 year
Brand names [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period		10 years
Brand names [Member] | Minimum [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	1 year
Brand names [Member] | Maximum [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	15 years
Others [Member] | Minimum [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	3 years	3 years
Others [Member] | Maximum [Member]
Weighted average amortization periods of intangible assets
Weighted average amortization period	5 years	5 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	yy_FiniteLivedIntangibleAssetUsefulLifeAbstract
Namespace Prefix:	yy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_InternetDomainNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TechnologyBasedIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=yy_OperatingRightsForLicensedGamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=yy_OperatingRightsForGamesBroadcastingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=yy_BrandNameMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OtherIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: