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Leases - Future minimum lease payments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 25, 2024	Dec. 31, 2023
Leases
Finance lease obligations	$ 0		$ 54,237
Amounts representing interest and deferred finance fees	0		(10,594)
Finance lease obligations, net of interest and deferred finance fees	$ 0		$ 43,643
Adjusted total finance lease payments		$ 0

X

- Definition

Amount necessary to reduce net minimum lease payments to present value for finance leases.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Present value of minimum lease payments for finance leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

+ References

No definition available.

+ Details

Name:	asc_FinanceLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Namespace Prefix:	asc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_FinanceLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

+ Details

Name:	us-gaap_FinanceLeaseLiabilityPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant