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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 559,566us-gaap_SalesRevenueNet	$ 576,422us-gaap_SalesRevenueNet
Cost of goods sold	378,294us-gaap_CostOfGoodsSold	414,492us-gaap_CostOfGoodsSold
Gross profit	181,272us-gaap_GrossProfit	161,930us-gaap_GrossProfit
Selling, general, and administrative expenses	41,809us-gaap_SellingGeneralAndAdministrativeExpense	39,548us-gaap_SellingGeneralAndAdministrativeExpense
Research, development, and testing expenses	39,685neu_ResearchDevelopmentAndTestingExpenses	32,207neu_ResearchDevelopmentAndTestingExpenses
Operating profit	99,778us-gaap_OperatingIncomeLoss	90,175us-gaap_OperatingIncomeLoss
Interest and financing expenses, net	3,816us-gaap_InterestExpense	4,164us-gaap_InterestExpense
Other income (expense), net	(2,325)us-gaap_OtherNonoperatingIncomeExpense	(2,216)us-gaap_OtherNonoperatingIncomeExpense
Income before income tax expense	93,637us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	83,795us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense	29,690us-gaap_IncomeTaxExpenseBenefit	26,272us-gaap_IncomeTaxExpenseBenefit
Net income	$ 63,947us-gaap_NetIncomeLoss	$ 57,523us-gaap_NetIncomeLoss
Earnings per share - basic and diluted (in dollars per share)	$ 5.14us-gaap_EarningsPerShareBasicAndDiluted	$ 4.43us-gaap_EarningsPerShareBasicAndDiluted
Cash dividends declared per share (in dollars per share)	$ 1.40us-gaap_CommonStockDividendsPerShareDeclared	$ 1.10us-gaap_CommonStockDividendsPerShareDeclared

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- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use; or (3) testing products in order to meet the requirements of a particular customer and for quality control purposes, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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