Name:	ish_AppraisedValueOfCapesizeVessels
Namespace Prefix:	ish_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

No definition available.

Name:	ish_BookValueOfPreviouslyHeldInterest
Namespace Prefix:	ish_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Discount rate used to calculate fair value of net assets acquired in a step acquisition.

No definition available.

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Namespace Prefix:	ish_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Gross amount, as of the balance sheet date, of capesize vessels.

No definition available.

Name:	ish_CapesizeVesselsGross
Namespace Prefix:	ish_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

In a business combination achieved in stages, this element represents the acquisition-date percentage of equity in the acquiree held by the co-venturer immediately before the acquisition date.

No definition available.

Name:	ish_EquityInterestPreviouslyHeldByCo-Venturer
Namespace Prefix:	ish_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The number of Capesize vessels controlled by the acquiree.

No definition available.

Name:	ish_NumberOfCapesizeVesselsControlledByAcquiree
Namespace Prefix:	ish_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of Capesize vessels transferred to the former co-venturer as consideration in a step acquisition transaction.

No definition available.

Name:	ish_NumberOfCapesizeVesselsTransferredToCo-Venturer
Namespace Prefix:	ish_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of former subsidiaries of the acquiree that were transferred to the former co-venturer as consideration in a step acquisition transaction.

No definition available.

Name:	ish_NumberOfFormerSubsidiariesOfAcquireeTransferredToCo-Venturer
Namespace Prefix:	ish_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of Handymax Newbuildings controlled by the acquiree.

No definition available.

Name:	ish_NumberOfHandymaxNewbuildingsControlledByAcquiree
Namespace Prefix:	ish_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of shipbuilding contracts relating to a Handymax vessel transferred to the former co-venturer as consideration in a step acquisition transaction.

No definition available.

Name:	ish_NumberOfHandymaxNewbuildingsTransferredToCo-Venturer
Namespace Prefix:	ish_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of subsidiaries of the acquiree that continue to control Capesize vessels and shipbuilding contracts relating to Handymax vessels subsequent to the step acquisition transaction.

No definition available.

Name:	ish_NumberOfSubsidiariesOfAcquireeControllingRemainingCapesizeVesselsAndHandymaxNewbuildings
Namespace Prefix:	ish_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of vessels controlled by the acquirer subsequent to the step acquisition transaction.

No definition available.

Name:	ish_NumberOfVesselsControlledByAcquirer
Namespace Prefix:	ish_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The percentage of the total fair value of net assets acquired in a step acquisition transaction that was discounted based on recent industry data.

No definition available.

Name:	ish_PercentageOfTotalFairValueDiscounted
Namespace Prefix:	ish_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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Balance Type:	debit
Period Type:	instant

- Details

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Percentage of voting equity interests acquired in the business combination.

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-Name Accounting Standards Codification

-Topic 805

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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-Publisher FASB

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In a business combination achieved in stages, this element represents the acquisition-date fair value of the equity interest in the acquiree held by the acquirer immediately before the acquisition date.

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-Publisher FASB

-Name Accounting Standards Codification

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Name:	us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue
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Data Type:	xbrli:monetaryItemType
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In a business combination achieved in stages, this element represents the acquisition-date percentage of equity in the acquiree held by the acquirer immediately before the acquisition date.

No definition available.

Name:	us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

Name:	us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
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The level of ownership or equity interest acquired in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Name:	us-gaap_NoncashOrPartNoncashAcquisitionInterestAcquired1
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The net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the future.

Name:	us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1
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The value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.