Debt Instrument, Interest Rate Computation Basis, Days in Year

No definition available.

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Namespace Prefix:	ntks_
Data Type:	xbrli:durationItemType
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Period Type:	duration

- Definition

Debt Instrument, Redemption Price, Make Whole Amount, Percentage

+ References

No definition available.

+ Details

Name:	ntks_DebtInstrumentRedemptionPriceMakeWholeAmountPercentage
Namespace Prefix:	ntks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_VariableRateAxis=ntks_TreasuryRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

NOTES, MORTGAGE NOTES AND OBLIGATIONS PAYABLE - 8.5% Senior Notes due 2021 (Details) (Senior Notes [Member])	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Nov. 23, 2010	Dec. 31, 2012	Oct. 18, 2012
8.5% Notes [Member]
Debt Instrument [Line Items]
Interest rate	8.50%		8.50%	8.50%
New 8.5% Notes [Member]
Debt Instrument [Line Items]
Interest rate computation basis, days in year	360 days
New 8.5% Notes [Member] \| Period Three [Member]
Debt Instrument [Line Items]
Redemption price, percentage	104.25%
New 8.5% Notes [Member] \| Period Four [Member]
Debt Instrument [Line Items]
Redemption price, percentage	102.125%
New 8.5% Notes [Member] \| Period Five [Member]
Debt Instrument [Line Items]
Redemption price, percentage	101.063%
New 8.5% Notes [Member] \| Period Six [Member]
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
New 8.5% Notes [Member] \| Period Two [Member]
Debt Instrument [Line Items]
Redemption price, make whole amount, percentage	1.00%
Percentage of principal amount redeemed	100.00%
10% Notes [Member]
Debt Instrument [Line Items]
Interest rate	10.00%	10.00%
Interest rate computation basis, days in year		360 days
10% Notes [Member] \| Period Three [Member]
Debt Instrument [Line Items]
Redemption price, percentage		102.50%
10% Notes [Member] \| Period Four [Member]
Debt Instrument [Line Items]
Redemption price, percentage		100.00%
10% Notes [Member] \| Period Two [Member]
Debt Instrument [Line Items]
Redemption price, percentage		105.00%
Treasury Rate [Member] \| 8.5% Notes [Member]
Debt Instrument [Line Items]
Variable rate	0.50%