Debt Instrument, Covenant Compliance, Borrowing Availability Restrictions Net Leverage Ratio

No definition available.

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- Definition

Debt Instrument, Covenant Compliance, Maximum Cash Dividends Allowed

+ References

No definition available.

+ Details

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- Definition

Represents the length of the year in days, considered for interest calculation on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Represents debt instrument reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Represents the minimum fixed charge coverage ratio that the entity must meet if borrowing availability under the Restated Credit Agreement is less than 20 million dollars.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of aggregate commitments which is necessary to be maintained under the terms of credit agreement, in case of which the entity is not required to achieve the fixed charge coverage ratio.

+ References

No definition available.

+ Details

Name:	np_LineOfCreditFacilityCovenantPercentageOfAggregateCommitmentsForNotMaintainingFixedChargeCoverageRatio
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- Definition

Represents the percentage of aggregate commitments to determine the stock repurchases and dividend payments.

+ References

No definition available.

+ Details

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- Definition

Represents the period to be maintained for available borrowing capacity.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Represents the period to be maintained for stock repurchase or dividend payment.

+ References

No definition available.

+ Details

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- Definition

Represents the remaining borrowing capacity which is necessary to be maintained under the terms of credit agreement, in case of which the entity is not required to achieve the fixed charge coverage ratio.

+ References

No definition available.

+ Details

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

- Definition

Represents the remaining borrowing capacity to determine the stock repurchases and dividend payments.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Represents the maximum borrowing capacity under line of credit facility that may be increased by the entity under certain conditions.

+ References

No definition available.

+ Details

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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

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Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

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

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- References

No definition available.

+ Details

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- 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

+ Details

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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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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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Debt - Narrative (Details)	1 Months Ended	12 Months Ended
Debt - Narrative (Details)	May 31, 2013 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Jan. 31, 2013 EUR (€)
Amended and Secured Revolving Credit Facility
Total debt		$ 255,500,000			$ 220,900,000
U.S Revolving Credit Facility \| Letter of Credit
Amended and Secured Revolving Credit Facility
Maximum borrowing capacity		20,000,000
German Revolving Credit Facility \| Letter of Credit
Amended and Secured Revolving Credit Facility
Maximum borrowing capacity		2,000,000
Global Revolving Credit Facilities (variable rates) due December 2019
Amended and Secured Revolving Credit Facility
Proceeds from borrowings		293,000,000	$ 113,600,000
Global Revolving Credit Facilities (variable rates) due December 2019 \| W.A. Sanders Coldenhove Holding B.V.
Amended and Secured Revolving Credit Facility
Proceeds from borrowings		$ 31,000,000
Global Revolving Credit Facilities (variable rates) due December 2019 \| FiberMark
Amended and Secured Revolving Credit Facility
Proceeds from borrowings			$ 38,000,000
Senior notes \| 2021 Senior Notes (5.25% fixed rate) due May 2021
2021 Senior Notes
Total term of notes	8 years
Face amount	$ 175,000,000
Fixed rate of interest (as a percent)	5.25%	5.25%		5.25%
Amended and Secured Revolving Credit Facility
Maximum cash dividends allowed to be paid		$ 25,000,000
Net leverage ratio, threshold in which dividends can be issued and shares may be repurchased without limitation		2.5
Total debt		$ 175,000,000			$ 175,000,000
Senior notes \| 2014 Senior Notes (7.375% fixed rate) retired June 2013
2021 Senior Notes
Total term of notes	10 years
Fixed rate of interest (as a percent)	7.375%
Amount of debt redeemed or repaid	$ 70,000,000
Secured debt \| Letter of Credit
Amended and Secured Revolving Credit Facility
Total debt outstanding		900,000
Secured debt \| Revolving bank credit facility (variable rates) due November 2017
2021 Senior Notes
Amount of debt redeemed or repaid	$ 56,000,000
Secured debt \| U.S Revolving Credit Facility
Amended and Secured Revolving Credit Facility
Maximum borrowing capacity		125,000,000
Secured debt \| German Revolving Credit Facility
Amended and Secured Revolving Credit Facility
Maximum borrowing capacity		75,000,000
Secured debt \| Global Revolving Credit Facilities (variable rates) due December 2019
Amended and Secured Revolving Credit Facility
Maximum borrowing capacity		250,000,000
Maximum borrowing capacity that may be increased		$ 50,000,000
Facility fee on unused amount of Revolver commitment (as a percent)		0.25%
Fixed charge coverage ratio required		1.1
Period to be maintained for stock repurchase or dividend payment		60 days
Period to be maintained for available borrowing capacity		60 days
Borrowing availability to determine stock repurchases and dividend payments		$ 25,000,000
Percentage of aggregate commitments to determine the stock repurchases and dividend payments		12.50%
Total debt outstanding		$ 76,900,000
Available credit		$ 91,900,000
Weighted-average interest rate (as a percent)		2.70%		2.70%	2.80%
Total debt		$ 76,900,000			$ 42,900,000
Secured debt \| Global Revolving Credit Facilities (variable rates) due December 2019 \| Minimum
Amended and Secured Revolving Credit Facility
Debt instrument, reference rate		0.00%
Borrowing availability for not achieving the fixed charge coverage ratio		$ 35,000,000
Percentage of aggregate commitments for not maintaining fixed charge coverage ratio		17.50%
Secured debt \| Global Revolving Credit Facilities (variable rates) due December 2019 \| Maximum
Amended and Secured Revolving Credit Facility
Borrowing availability for not achieving the fixed charge coverage ratio		$ 20,000,000
Percentage of aggregate commitments for not maintaining fixed charge coverage ratio		10.00%
Secured debt \| Second German Loan Agreement (2.45% fixed rate) due in 32 equal quarterly installments ending September 2022
2021 Senior Notes
Fixed rate of interest (as a percent)		2.45%		2.45%
Amended and Secured Revolving Credit Facility
Maximum borrowing capacity \| €						€ 9,000,000.0
Interest rate on amounts outstanding (as a percent)		2.45%		2.45%
Length of the year considered for interest calculation		360 days
Total debt		$ 6,400,000		€ 5,300,000	$ 6,800,000
LIBOR \| U.S Revolving Credit Facility \| Minimum
Amended and Secured Revolving Credit Facility
Debt instrument basis spread on variable rate (as a percent)		0.00%
LIBOR \| U.S Revolving Credit Facility \| Maximum
Amended and Secured Revolving Credit Facility
Debt instrument basis spread on variable rate (as a percent)		0.50%
LIBOR \| German Revolving Credit Facility \| Minimum
Amended and Secured Revolving Credit Facility
Debt instrument basis spread on variable rate (as a percent)		1.50%
LIBOR \| German Revolving Credit Facility \| Maximum
Amended and Secured Revolving Credit Facility
Debt instrument basis spread on variable rate (as a percent)		2.00%
LIBOR \| Secured debt \| Global Revolving Credit Facilities (variable rates) due December 2019 \| Minimum
Amended and Secured Revolving Credit Facility
Debt instrument basis spread on variable rate (as a percent)		1.50%
LIBOR \| Secured debt \| Global Revolving Credit Facilities (variable rates) due December 2019 \| Maximum
Amended and Secured Revolving Credit Facility
Debt instrument basis spread on variable rate (as a percent)		2.00%