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Significant accounting policies (Details)	12 Months Ended
	Dec. 31, 2013
Orion Tankers Pool [Abstract]
Direct and indirect ownership in all subsidiary (in hundredths)	100.00%
Vessels [Abstract]
Estimated useful life of vessels	25 years
Impairment Of Long-Lived Assets [Abstract]
Estimated useful life	5 years
Income taxes [Abstract]
Standard corporation tax rate (in hundredths)	12.50%
Higher corporation tax rate (in hundredths)	25.00%
Minimum [Member]
Drydock expenditure [Line Items]
Drydock expenditure, amortization period	3 years
Maximum [Member]
Drydock expenditure [Line Items]
Drydock expenditure, amortization period	5 years

X

- Definition

The percentage of ownership held in the subsidiary.

+ References

No definition available.

+ Details

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

X

- Definition

The useful life of drydock expenditure.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Percentage of higher corporation tax rate applicable to passive or non-trading pretax income (loss).

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Definition

The useful life of other non-current assets.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of higher corporation tax rate applicable to trading pretax income (loss).

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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