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v3.26.1

VARIABLE INTEREST ENTITY - Additional Information (Details) | 12 Months Ended
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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

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- 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

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- 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

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- References No definition available. + Details
Name: | ncty_VariableInterestEntityAbstract
Namespace Prefix: | ncty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration