v3.20.1

Goodwill and Intangible Assets, Net - Summary of Company's Intangible Assets (Parenthetical) (Details) - Education assessment caseware | 12 Months Ended
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Dec. 31, 2019 item grade
Intangible assets |
Number of subjects included | item | 3
Number of grades of junior and senior high school included | grade | 6

X
- Definition Number of grades of junior and senior high school. + References No definition available. + Details
Name: | aacg_NumberOfGrades
Namespace Prefix: | aacg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of subjects, including but not limited to Literature, Mathematics and English. + References No definition available. + Details
Name: | aacg_NumberOfSubjects
Namespace Prefix: | aacg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=aacg_EducationAssessmentCasewareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |