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Share-based compensation - Dividend equivalent rights - Cost related to non-vested awards expected (Details) - Dividend equivalent rights | Sep. 30, 2021 USD ($)
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
2020 | $ 23,408
Total | $ 23,408

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- Definition Unrecognized cost of unvested share-based compensation awards yet to be recognized in current year. + References No definition available. + Details
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Namespace Prefix: | asc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=asc_DividendEquivalentRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |