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Note 6 - Acquisitions (Details) - Assets Acquired and Liabilities Assumed (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 6 - Acquisitions (Details) - Assets Acquired and Liabilities Assumed [Line Items]      
Goodwill $ 91,893us-gaap_Goodwill $ 94,064us-gaap_Goodwill $ 87,388us-gaap_Goodwill
Terrafirma Roadways [Member]      
Note 6 - Acquisitions (Details) - Assets Acquired and Liabilities Assumed [Line Items]      
Receivables, net   2,155us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Property, plant and equipment, net   2,160us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Goodwill   4,544us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Other intangibles, net   3,328us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Total assets acquired   12,187us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Accounts payable   3,350us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Short-term debt   284nr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesShortTermDebt
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Accrued liabilities   285us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Deferred tax liability   1,092us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Other noncurrent liabilities   400us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Total liabilities assumed   5,411us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember
 
Total cash conveyed at closing   $ 6,776us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nr_TerrafirmaRoadwaysMember