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Short-term and Long-term deposits (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)
Shortterm and Longterm deposits [Line Items]
Short-term deposits	¥ 7,326,996	$ 1,065,667	¥ 6,000,104
RMB [Member]
Shortterm and Longterm deposits [Line Items]
Short-term deposits	2,100,000		3,400,000
Long-term deposits	1,000,000		0
US$ [Member]
Shortterm and Longterm deposits [Line Items]
Short-term deposits	¥ 5,226,996	$ 761,573	¥ 2,600,104	$ 397,816

X

- Definition

Long-term deposits represent time deposits placed with banks with original maturities more than one year.

+ References

No definition available.

+ Details

Name:	yy_LongTermDeposit
Namespace Prefix:	yy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Short-term deposits represent time deposits placed with banks with original maturities of less than one year. Interest earned is recorded as interest income in the consolidated statements of comprehensive income during the periods presented.

+ References

No definition available.

+ Details

Name:	yy_ShortTermDeposit
Namespace Prefix:	yy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Details

Name:	srt_CurrencyAxis=currency_CNY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: