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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

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Namespace Prefix:	asc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of fair market value.

+ References

No definition available.

+ Details

Name:	asc_FairMarketValuePercentage
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

Name:	asc_MinimumNetWorthRequired
Namespace Prefix:	asc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Name:	asc_NumberOfDaysToProvideNoticeForDrawDownOrRepaymentOfDebt
Namespace Prefix:	asc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of finance lease facility in operations.

+ References

No definition available.

+ Details

Name:	asc_NumberOfFinanceLeaseFacility
Namespace Prefix:	asc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents number of subsidiaries.

+ References

No definition available.

+ Details

Name:	asc_NumberOfSubsidiaries
Namespace Prefix:	asc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of vessels employed by the company

+ References

No definition available.

+ Details

Name:	asc_NumberOfVesselsEmployed
Namespace Prefix:	asc_
Data Type:	xbrli:integerItemType
Balance Type:	na
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

Name:	asc_RequiredMinimumCashBalance
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

Name:	asc_RequiredMinimumSolvencyCovenant
Namespace Prefix:	asc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

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

X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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- Details

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- Details

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