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VARIABLE INTEREST ENTITY - Additional Information (Details)	12 Months Ended
	Dec. 31, 2025
VARIABLE INTEREST ENTITY
Percentage of operating profit generated by the VIEs	90.00%
Initial term of exclusive technical service agreement	20 years

X

- Definition

Initial Term Of Exclusive Technical Service Agreement

+ References

No definition available.

+ Details

Name:	ncty_InitialTermOfExclusiveTechnicalServiceAgreement
Namespace Prefix:	ncty_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of Consolidated Operating Revenues

+ References

No definition available.

+ Details

Name:	ncty_PercentageOfConsolidatedOperatingRevenues
Namespace Prefix:	ncty_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ncty_VariableInterestEntityAbstract
Namespace Prefix:	ncty_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration