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Debt - Additional information (Details) $ in Millions |  |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 25, 2021 item | Dec. 17, 2020 USD ($) subsidiary | Jul. 17, 2020 | Dec. 11, 2019 USD ($) subsidiary | Sep. 12, 2014 USD ($) subsidiary | Sep. 30, 2021 item facility | Sep. 30, 2021 item | Sep. 30, 2021 USD ($) | Sep. 30, 2021 | Oct. 24, 2017 USD ($)
Number of loan facilities |  |  |  |  |  | 5 | 7 |  |  |
Number of vessels with loans | item |  |  |  |  |  | 11 |  |  |  |
Required minimum cash and cash equivalents |  |  |  |  |  |  |  | $ 19.2 |  |
Minimum Net Worth Required |  |  |  |  |  |  |  | $ 150.0 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Required Minimum Solvency Covenant |  |  |  |  |  | 30.00% |  |  |  |
Cash and Cash Equivalent Percentage |  |  |  |  |  |  |  |  | 5.00% |
Fair market Value Percentage |  |  |  |  |  | 130.00% |  |  |  |
NIBC Bank Facility [Member] |  |  |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  |  |  |  | 1 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 13.5 |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.90% |  |  |  |  |
Nordea SEB Joint Bank Facility [Member] |  |  |  |  |  |  |  |  |  |
Number of vessels with loans | item | 2 |  |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  |  |  | 8 |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 100.0 |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.40% |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | LIBOR plus 2.4% |  |  |  |  |  |
Debt Instrument Maturity Period |  |  |  | December 2024 |  |  |  |  |  |
Nordea SEB Revolving Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 40.0 |  |  |  |  |  |
Number of days to provide notice for draw down or repayment of debt |  |  |  | 5 days |  |  |  |  |  |
ABN CACIB Joint Bank Facility [Member] |  |  |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  |  |  | 4 |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 61.5 |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.40% |  |  |  |  |  |
Debt Instrument Maturity Period |  |  |  | December 2024 |  |  |  |  |  |
ABN AMRO Revolving Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 15.0
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.90% |  |  |  |  |  |  |
IYO Bank Facility |  |  |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  | 1 |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 10.0 |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |  |  |  |  |
Debt Instrument Maturity Period |  | December 2025 |  |  |  |  |  |  |  |

X
- Definition Percentage of cash and cash equivalents required to be maintained. + References No definition available. + Details
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Namespace Prefix: | asc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period when the debt instrument is scheduled to be fully repaid. + References No definition available. + Details
Name: | asc_DebtInstrumentMaturityPeriod
Namespace Prefix: | asc_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Percentage of fair market value. + References No definition available. + Details
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Namespace Prefix: | asc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum net worth required under the debt covenant as of the balance sheet date. + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Number of days within which the company has to provide notice for drawing down or repayment of debt. + References No definition available. + Details
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Namespace Prefix: | asc_
Data Type: | xbrli:durationItemType
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Period Type: | duration

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- Definition The number of finance lease facility in operations. + References No definition available. + Details
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- Definition Represents number of subsidiaries. + References No definition available. + Details
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- Definition The number of vessels employed by the company + References No definition available. + Details
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Period Type: | duration

X
- Definition The minimum cash balance required under the debt covenants as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | asc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The minimum solvency required under the debt covenants as of the balance sheet date. + References No definition available. + Details
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X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
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- Details
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- Details
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- Details
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- Details
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