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Segment Information (Consolidated Revenue By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Information [Line Items]    
Consolidated revenue $ 559,566us-gaap_SalesRevenueNet $ 576,422us-gaap_SalesRevenueNet
Operating Segments [Member] | Petroleum Additives [Member]    
Segment Information [Line Items]    
Consolidated revenue 554,765us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= neu_PetroleumAdditivesMember
574,045us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= neu_PetroleumAdditivesMember
Operating Segments [Member] | All Other [Member]    
Segment Information [Line Items]    
Consolidated revenue 4,801us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
2,377us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Operating Segments [Member] | Lubricant Additives [Member] | Petroleum Additives [Member]    
Segment Information [Line Items]    
Consolidated revenue 453,722us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_ProductOrServiceAxis
= neu_LubricantAdditivesMember
/ us-gaap_StatementBusinessSegmentsAxis
= neu_PetroleumAdditivesMember
473,349us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_ProductOrServiceAxis
= neu_LubricantAdditivesMember
/ us-gaap_StatementBusinessSegmentsAxis
= neu_PetroleumAdditivesMember
Operating Segments [Member] | Fuel Additives [Member] | Petroleum Additives [Member]    
Segment Information [Line Items]    
Consolidated revenue $ 101,043us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_ProductOrServiceAxis
= neu_FuelAdditivesMember
/ us-gaap_StatementBusinessSegmentsAxis
= neu_PetroleumAdditivesMember
$ 100,696us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_ProductOrServiceAxis
= neu_FuelAdditivesMember
/ us-gaap_StatementBusinessSegmentsAxis
= neu_PetroleumAdditivesMember