Alternate Base Rate, Basis Spread on Variable Rate

No definition available.

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Period Type:	instant

- Definition

Debt Instrument, Quarterly Payments

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Foreign Subsidiary, First Tier, Voting Capital Pledged as Collateral, Percent

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Cash Deposit Requirements, Remaining Borrowing Capacity

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Terms, Basis Of Consolidated Fixed Charge Coverage Ratio, Number Of Trailing Quarters

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Terms, Borrowing Base, Net Eligible Accounts Receivable, Percent

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Terms, Borrowing Base, Net Orderly Liquidation Value of Eligible Inventory, Percent

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Terms, Consolidated Fixed Charge Coverage Ratio, Minimum

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Line of Credit Facility, Covenant Terms, Requirement To Deposit Cash, Excess Availability, Minimum

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Terms, Requirement To Deposit Cash, Excess Availability, Percent Of Borrowing Base, Minimum

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Terms, Requirement To Satisfy Fixed Charge Coverage Ratio, Excess Availability, Minimum

+ References

No definition available.

+ Details

Name:	ntks_LineOfCreditFacilityCovenantTermsRequirementToSatisfyFixedChargeCoverageRatioExcessAvailabilityMinimum
Namespace Prefix:	ntks_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Covenant Terms, Requirement To Satisfy Fixed Charge Coverage Ratio, Excess Availability, Percent Of Borrowing Base, Minimum

+ References

No definition available.

+ Details

Name:	ntks_LineOfCreditFacilityCovenantTermsRequirementToSatisfyFixedChargeCoverageRatioExcessAvailabilityPercentOfBorrowingBaseMinimum
Namespace Prefix:	ntks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Repayment Terms, Percent of Annual Excess Cash Flow

+ References

No definition available.

+ Details

Name:	ntks_LineOfCreditFacilityRepaymentTermsPercentOfAnnualExcessCashFlow
Namespace Prefix:	ntks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Repayment Terms, Percent of Annual Excess Cash Flow Based on Secured Leverage Ratio

+ References

No definition available.

+ Details

Name:	ntks_LineOfCreditFacilityRepaymentTermsPercentOfAnnualExcessCashFlowBasedOnSecuredLeverageRatio
Namespace Prefix:	ntks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Repayment Terms, Percent of Net Cash Proceeds from Debt Issuance

+ References

No definition available.

+ Details

Name:	ntks_LineOfCreditFacilityRepaymentTermsPercentOfNetCashProceedsFromDebtIssuance
Namespace Prefix:	ntks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Repayment Terms, Percent of Net Cash Proceeds of Asset Sales and Casualty

+ References

No definition available.

+ Details

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Namespace Prefix:	ntks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
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

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

- Details

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

- Definition

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

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 210.5-02.17)

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
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Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

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NOTES, MORTGAGE NOTES AND OBLIGATIONS PAYABLE - Term Loan and ABL Facilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Nov. 23, 2010	Apr. 30, 2014	Jun. 30, 2012	Jun. 13, 2012
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Alternate base rate, margin	0.50%
LIBOR Rate [Member]
Debt Instrument [Line Items]
Alternate base rate, margin	1.00%
Senior Notes [Member] \| 10% Notes [Member]
Debt Instrument [Line Items]
Interest rate	10.00%	10.00%
Term Loan Facility [Member] \| 3.8% Notes [Member]
Debt Instrument [Line Items]
Interest rate	3.75%
Quarterly payments	$ 875,000
Repayment terms, percent of annual excess cash flow			50.00%
Repayment terms, percent of net cash proceeds of asset sales and casualty			100.00%
Repayment terms, percent of net cash proceeds from debt issuance			100.00%
Remaining borrowing capacity			275,000,000
Voting capital pledged as collateral (percent)	65.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Deferred finance costs				1,200,000
Maximum borrowing capacity					300,000,000.0
Borrowing base as net amount of eligible accounts receivable					85.00%
Borrowing base as net orderly liquidation value of eligible inventory					85.00%
Remaining borrowing capacity	287,500,000
Excess availability	30,000,000
Excess availability, percent of borrowing base	12.50%
Excess availability before triggering cash deposit requirements	250,000,000
Requirement to satisfy fixed charge coverage ratio, excess availability	30,000,000.0
Requirement to satisfy fixed charge coverage ratio, excess availability, percent of borrowing base	12.50%
Basis of consolidated fixed charge coverage ratio, number of trailing quarters	4
Consolidated fixed charge coverage ratio	1.0
Domestic Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					280,000,000.0
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					60,000,000.0
Outstanding borrowings	12,500,000
Bridge Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					20,000,000.0
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 20,000,000.0
Minimum [Member] \| Term Loan Facility [Member] \| 3.8% Notes [Member]
Debt Instrument [Line Items]
Repayment terms, percent of annual excess cash flow based on secured leverage ratio			25.00%
Minimum [Member] \| Domestic Line of Credit [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Margin percentage	1.75%
Minimum [Member] \| Foreign Line of Credit [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Margin percentage	0.75%
Maximum [Member] \| Term Loan Facility [Member] \| 3.8% Notes [Member]
Debt Instrument [Line Items]
Repayment terms, percent of annual excess cash flow based on secured leverage ratio			0.00%
Maximum [Member] \| Domestic Line of Credit [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Margin percentage	2.25%
Maximum [Member] \| Foreign Line of Credit [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Margin percentage	1.25%