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EXIT AND DISPOSAL ACTIVITIES - Warehousing and Distribution Consolidation (Details) (Warehousing and Distribution Consolidation [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]  
Outsourcing and agreement period 5 years
Employee Related and Other Costs [Member]
 
Restructuring Cost and Reserve [Line Items]  
Restructuring costs incurred to date 3.0us-gaap_RestructuringAndRelatedCostCostIncurredToDate
/ us-gaap_RestructuringCostAndReserveAxis
= ntks_EmployeeRelatedandOtherCostsMember
/ us-gaap_RestructuringPlanAxis
= ntks_WarehousingAndDistributionConsolidationMember
SCS [Member] | Employee Related and Other Costs [Member]
 
Restructuring Cost and Reserve [Line Items]  
Restructuring costs incurred to date 2.0us-gaap_RestructuringAndRelatedCostCostIncurredToDate
/ us-gaap_RestructuringCostAndReserveAxis
= ntks_EmployeeRelatedandOtherCostsMember
/ us-gaap_RestructuringPlanAxis
= ntks_WarehousingAndDistributionConsolidationMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_SecurityandControlSolutionsSCSMember
ERG [Member] | Employee Related and Other Costs [Member]
 
Restructuring Cost and Reserve [Line Items]  
Restructuring costs incurred to date 0.6us-gaap_RestructuringAndRelatedCostCostIncurredToDate
/ us-gaap_RestructuringCostAndReserveAxis
= ntks_EmployeeRelatedandOtherCostsMember
/ us-gaap_RestructuringPlanAxis
= ntks_WarehousingAndDistributionConsolidationMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_ErgonomicandProductivitySolutionsERGMember
AVC [Member] | Employee Related and Other Costs [Member]
 
Restructuring Cost and Reserve [Line Items]  
Restructuring costs incurred to date 0.4us-gaap_RestructuringAndRelatedCostCostIncurredToDate
/ us-gaap_RestructuringCostAndReserveAxis
= ntks_EmployeeRelatedandOtherCostsMember
/ us-gaap_RestructuringPlanAxis
= ntks_WarehousingAndDistributionConsolidationMember
/ us-gaap_StatementBusinessSegmentsAxis
= ntks_AudioVideoandControlSolutionsAVCMember