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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) | Dec. 31, 2025
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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY |
Acquisition of non-controlling interest (percent) | 49.00%

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- Definition Percentage of interest acquired from non-controlling interest. + References No definition available. + Details
Name: | ncty_PercentageOfInterestAcquiredFromNonControllingInterest
Namespace Prefix: | ncty_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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