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GUARANTOR FINANCIAL STATEMENTS - Narrative (Details) (Senior Notes [Member])
Dec. 31, 2014
Nov. 23, 2010
Dec. 31, 2012
Oct. 18, 2012
10% Notes [Member]
       
Debt Instrument [Line Items]        
Interest rate 10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ntks_SeniorNotesDue201810PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ntks_SeniorNotesDue201810PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
8.5% Notes [Member]
       
Debt Instrument [Line Items]        
Interest rate 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ntks_SeniorNotesDue202185PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ntks_SeniorNotesDue202185PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ntks_SeniorNotesDue202185PercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember