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Management fees (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Related Party Transaction [Line Items]
Management fees	$ (4,063,000)	$ 0
Ship Procurement Services S.A. ("SPS")
Related Party Transaction [Line Items]
Management fees	3,748,000
Procurement services daily fee	295
Maryville Maritime Inc.
Related Party Transaction [Line Items]
Management fees	$ 315,000	$ 0

X

- Definition

The daily fee per vessel for procurement services.

+ References

No definition available.

+ Details

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X

- Definition

Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Details

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Balance Type:
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X

- Details

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