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

- Definition

Refers to the EBITDA plus a portion of cash in excess of our minimum liquidity to total interest expense shall be maintained.

+ References

No definition available.

+ Details

Name:	asc_MinimumEbitdaPlusPortionOfCashInExcessOfOurMinimumLiquidityToTotalInterestExpense
Namespace Prefix:	asc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- 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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- 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

+ Details

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

- Definition

Amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1927-112601

+ Details

Name:	us-gaap_ShortTermDebtRefinancedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=asc_NibcBankFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=asc_CacibBankFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=asc_TrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=asc_AdditionalFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=asc_AbnDvbNibcJointBankFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=asc_TrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=asc_NordeaSebJointBankFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=asc_AbnAmroFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Details Textual) - USD ($) $ in Millions			1 Months Ended				3 Months Ended
Debt (Details Textual) - USD ($) $ in Millions	Mar. 10, 2016	Jan. 13, 2016	Aug. 04, 2016	Jul. 29, 2016	Jan. 22, 2016	Sep. 30, 2014	Mar. 31, 2017	Sep. 12, 2014	May 22, 2014
Required Minimum Solvency Covenant							30.00%
Required Minimum Cash Balance							$ 23.1
Minimum Net Worth Required							$ 150.0
Short-term Debt, Refinanced, Amount		$ 20.0
Minimum [Member]
Minimum ratio of EBITDA plus a portion of cash in excess of our minimum liquidity to total interest expense							1
Cash and Cash Equivalent Percentage							5.00%
Fair market Value Percentage							130.00%
Maximum [Member]
Minimum ratio of EBITDA plus a portion of cash in excess of our minimum liquidity to total interest expense							2.25
NIBC Bank Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 13.5
Debt Instrument Maturity Period							2021
NIBC Bank Facility [Member] \| LIBOR [Member]
Debt Instrument, Basis Spread on Variable Rate						2.90%
CACIB Bank Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 39.0
Debt Instrument Maturity Period							2022
CACIB Bank Facility [Member] \| Tranche I [Member]
Debt Instrument, Basis Spread on Variable Rate	2.50%
CACIB Bank Facility [Member] \| Additional Financing [Member]
Short-term Debt, Refinanced, Amount	$ 25.0
ABN/DVB/NIBC Joint Bank Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		213.0
Line Of Credit Facility Maximum Borrowing Capacity Increase Amount			$ 36.6
Short-term Debt, Refinanced, Amount		$ 20.0
Debt Instrument Maturity Period			2023
ABN/DVB/NIBC Joint Bank Facility [Member] \| LIBOR [Member]
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 2.55%
Debt Instrument Maturity Period		2022
ABN/DVB/NIBC Joint Bank Facility [Member] \| LIBOR [Member] \| Tranche II [Member]
Debt Instrument, Description of Variable Rate Basis			LIBOR plus 2.75%
Nordea/SEB Joint Bank Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 151.0
Long-term Line of Credit					$ 2.3
Debt Instrument Maturity Period					2022
Nordea/SEB Joint Bank Facility [Member] \| LIBOR [Member]
Debt Instrument, Description of Variable Rate Basis					LIBOR plus 2.50%
ABN AMRO Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 71.3
Debt Instrument Maturity Period				2023
ABN AMRO Facility [Member] \| LIBOR [Member]
Debt Instrument, Description of Variable Rate Basis				LIBOR plus 2.75%