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Commitments And Contingencies (Details) (USD $)
In Millions, unless otherwise specified
Jan. 06, 2015
Jun. 26, 2014
item
Commitments And Contingencies [Line Items]    
Deposit and interest collected $ 4.2ish_DepositAndInterestCollected  
Deposit reclassified to current receivable 3.9ish_DepositReclassifiedToCurrentReceivable  
Interest accrued on receivable from customer 0.3ish_InterestAccruedOnReceivable  
U.S. Customs And Border Protection [Member]    
Commitments And Contingencies [Line Items]    
Number of affiliates that allegedly failed to properly report the importation of spare parts consumed by vessels   2ish_NumberOfAffiliatesThatAllegedlyFailedToProperlyReportImportationOfSpareParts
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= ish_USCustomsAndBorderProtectionMember
Amount of proposed duty   2.1ish_ProposedDutyAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= ish_USCustomsAndBorderProtectionMember
Amount of proposed penalty on assessment   $ 8.4ish_ProposedPenaltyOnAssessmentAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= ish_USCustomsAndBorderProtectionMember