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Other Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities [Abstract]    
Deferred tax liabilities $ 16,017us-gaap_DeferredTaxLiabilitiesNoncurrent $ 13,952us-gaap_DeferredTaxLiabilitiesNoncurrent
Reserve for other tax liabilities 7,324nus_ReserveForOtherTaxLiabilities 8,786nus_ReserveForOtherTaxLiabilities
Reserve for customs assessment 4,727nus_ReserveForCustomsAssessment 9,810nus_ReserveForCustomsAssessment
Cash surrender value for life insurance policies 32,398us-gaap_CashSurrenderValueDuePolicyholdersAmount 28,544us-gaap_CashSurrenderValueDuePolicyholdersAmount
Pension plan benefits reserve 5,844us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 6,176us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Build to suit - financing obligation 10,421nus_BuildToSuitFinancingObligation 0nus_BuildToSuitFinancingObligation
Deferred rent and deferred tenant incentives 7,102us-gaap_DeferredRentCreditNoncurrent 0us-gaap_DeferredRentCreditNoncurrent
Asset retirement obligation 4,611us-gaap_AssetRetirementObligationsNoncurrent 4,090us-gaap_AssetRetirementObligationsNoncurrent
Other 656us-gaap_OtherSundryLiabilitiesNoncurrent 441us-gaap_OtherSundryLiabilitiesNoncurrent
Total other liabilities $ 89,100us-gaap_OtherLiabilitiesNoncurrent $ 71,799us-gaap_OtherLiabilitiesNoncurrent