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Fair Value Of Financial Instruments, Derivative And Marketable Securities (Narrative) (Details)
 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
USD ($)
contract
Dec. 31, 2013
USD ($)
contract
Dec. 31, 2013
JPY (¥)
Dec. 31, 2014
PT Amas [Member]
USD ($)
item
Dec. 31, 2014
Other Comprehensive Income (Loss) [Member]
USD ($)
Dec. 31, 2013
Other Comprehensive Income (Loss) [Member]
USD ($)
Dec. 31, 2014
Foreign Exchange Contract 1 [Member]
USD ($)
Dec. 31, 2014
Foreign Exchange Contract 1 [Member]
MXN
Dec. 31, 2014
Foreign Exchange Contract 2 [Member]
USD ($)
Dec. 31, 2014
Foreign Exchange Contract 2 [Member]
MXN
Dec. 31, 2014
Foreign Exchange Contract 3 [Member]
USD ($)
Dec. 31, 2014
Foreign Exchange Contract 3 [Member]
MXN
Sep. 30, 2014
July Foreign Exchange Contract [Member]
contract
Dec. 31, 2014
July Foreign Exchange Contract [Member]
JPY (¥)
contract
item
Derivative Instruments, Gain (Loss) [Line Items]                                
Maximum potential future exposure on derivatives     $ 7,300,000ish_MaximumPotentialFutureExposureOnDerivatives                          
Unrealized loss related to derivative instruments included in accumulated other comprehensive loss             3,700,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_OtherComprehensiveIncomeMember		 4,300,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_OtherComprehensiveIncomeMember		                
Number of forward purchase contracts     3ish_NumberOfForwardPurchaseContracts                          
Number of foreign currency derivatives held       3us-gaap_NumberOfForeignCurrencyDerivativesHeld 3us-gaap_NumberOfForeignCurrencyDerivativesHeld                     4us-gaap_NumberOfForeignCurrencyDerivativesHeld
/ us-gaap_DerivativeByNatureAxis
= ish_JulyForeignExchangeContractMember
Notional amount of forward purchase contracts     31,451,000invest_DerivativeNotionalAmount   3,300,000,000invest_DerivativeNotionalAmount       900,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ish_ForeignExchangeContract1Member		   900,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ish_ForeignExchangeContract2Member		   600,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ish_ForeignExchangeContract3Member		     3,100,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ish_JulyForeignExchangeContractMember
Exchange rate         102.53us-gaap_DerivativeForwardExchangeRate1         13.6007us-gaap_DerivativeForwardExchangeRate1
/ us-gaap_DerivativeByNatureAxis
= ish_ForeignExchangeContract1Member		   13.7503us-gaap_DerivativeForwardExchangeRate1
/ us-gaap_DerivativeByNatureAxis
= ish_ForeignExchangeContract2Member		   14.1934us-gaap_DerivativeForwardExchangeRate1
/ us-gaap_DerivativeByNatureAxis
= ish_ForeignExchangeContract3Member		    
Projected Peso exposure represented by Mexican Peso foreign exchange contracts (in hundredths)     85.00%ish_ProjectedPesoExposureRepresentedByMexicanPesoForeignExchangeContracts                          
Number of expired contracts                             1ish_NumberOfExpiredContracts
/ us-gaap_DerivativeByNatureAxis
= ish_JulyForeignExchangeContractMember		  
Number of contracts which coincide to the next two scheduled quarterly loan installments                               2ish_NumberOfContractsCoincidingWithQuarterlyLoanInstallments
/ us-gaap_DerivativeByNatureAxis
= ish_JulyForeignExchangeContractMember
Number of quarterly loan installments coincided by contracts                               2ish_NumberOfQuarterlyLoanInstallmentsCoincidedByContracts
/ us-gaap_DerivativeByNatureAxis
= ish_JulyForeignExchangeContractMember
Approximate amount of quarterly loan installments                               85,000,000ish_ApproximateQuarterlyLoanInstallmentsAmount
/ us-gaap_DerivativeByNatureAxis
= ish_JulyForeignExchangeContractMember
Derivatives, notional amount remaining after quarterly loan installments                               2,885,000,000ish_DerivativeNotionalAmountRemainingAfterQuarterlyLoanInstallments
/ us-gaap_DerivativeByNatureAxis
= ish_JulyForeignExchangeContractMember
Long-term debt, fair value     244,500,000us-gaap_LongTermDebtFairValue                          
Notes receivable, carrying amount     29,300,000us-gaap_AccountsAndNotesReceivableNet                          
Number of vessels sold           2ish_NumberOfVesselsSold
/ us-gaap_CounterpartyNameAxis
= ish_PtAmasMember		                    
Remaining balance           27,700,000us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_CounterpartyNameAxis
= ish_PtAmasMember		                    
Annual interest rate           7.00%ish_LoansReceivableAnnualInterestRate
/ us-gaap_CounterpartyNameAxis
= ish_PtAmasMember		                    
Marketable securities, gain 447,000us-gaap_MarketableSecuritiesGainLoss                              
Gain on sale of investments   580,000us-gaap_GainLossOnSaleOfInvestments                            
Marketable securities held     $ 0us-gaap_MarketableSecurities $ 0us-gaap_MarketableSecurities