Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 102,278us-gaap_NetIncomeLoss	$ 65,323us-gaap_NetIncomeLoss	$ 60,032us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operations:
Impairment charges		176us-gaap_AssetImpairmentCharges	443us-gaap_AssetImpairmentCharges
Depreciation and amortization	42,030	44,198	32,821
Stock-based compensation expense	12,304us-gaap_ShareBasedCompensation	9,699us-gaap_ShareBasedCompensation	7,103us-gaap_ShareBasedCompensation
Provision for deferred income taxes	(2,328)nr_ProvisionForDeferredIncomeTaxes	(7,832)nr_ProvisionForDeferredIncomeTaxes	1,358nr_ProvisionForDeferredIncomeTaxes
Net provision for doubtful accounts	1,252us-gaap_ProvisionForDoubtfulAccounts	416us-gaap_ProvisionForDoubtfulAccounts	1,709us-gaap_ProvisionForDoubtfulAccounts
Gain on sale of a business	(33,974)
(Gain) loss on sale of assets	(1,369)us-gaap_GainLossOnDispositionOfAssets	(3,178)us-gaap_GainLossOnDispositionOfAssets	724us-gaap_GainLossOnDispositionOfAssets
Excess tax benefit from stock-based compensation	(1,278)	(2,146)
Change in assets and liabilities:
(Increase) decrease in receivables	(53,494)us-gaap_IncreaseDecreaseInReceivables	32,172us-gaap_IncreaseDecreaseInReceivables	23,565us-gaap_IncreaseDecreaseInReceivables
(Increase) decrease in inventories	(14,136)us-gaap_IncreaseDecreaseInInventories	16,431us-gaap_IncreaseDecreaseInInventories	(28,758)us-gaap_IncreaseDecreaseInInventories
(Increase) decrease in other assets	(546)	4,574	(641)
Increase (decrease) in accounts payable	23,606	(17,733)	13,702
Increase (decrease) in accrued liabilities and other	14,828	9,803	(1,813)
Net cash provided by operating activities	89,173	151,903	110,245
Cash flows from investing activities:
Capital expenditures	(106,973)	(67,929)	(43,955)
Proceeds from sale of property, plant and equipment	3,205	1,313	863
Proceeds from sale of a business	89,766	13,329
Business acquisitions, net of cash acquired		(6,776)	(53,075)
Net cash used in investing activities	(14,002)	(60,063)	(96,167)
Cash flows from financing activities:
Borrowings on lines of credit	62,164us-gaap_ProceedsFromLinesOfCredit	254,390us-gaap_ProceedsFromLinesOfCredit	364,426us-gaap_ProceedsFromLinesOfCredit
Payments on lines of credit	(62,445)us-gaap_RepaymentsOfLinesOfCredit	(328,086)us-gaap_RepaymentsOfLinesOfCredit	(296,944)us-gaap_RepaymentsOfLinesOfCredit
Principal payments on notes payable and long-term debt	(55)us-gaap_RepaymentsOfLongTermDebt	(25)us-gaap_RepaymentsOfLongTermDebt	(40)us-gaap_RepaymentsOfLongTermDebt
Proceeds from employee stock plans	3,442	8,328	1,059
Post-closing payments for business acquisitions	(412)		(11,892)
Purchases of treasury stock	(53,130)	(9,281)	(50,756)
Excess tax benefit from stock-based compensation	1,278	2,146
Net cash (used in) provided by financing activities	(49,158)	(72,528)	5,853
Effect of exchange rate changes on cash	(6,801)	(318)	1,668
Net increase in cash and cash equivalents	19,212	18,994	21,599
Cash and cash equivalents at beginning of year	65,840	46,846	25,247
Cash and cash equivalents at end of year	85,052	65,840	46,846
Cash paid for:
Income taxes (net of refunds)	56,568us-gaap_IncomeTaxesPaidNet	31,101us-gaap_IncomeTaxesPaidNet	24,508us-gaap_IncomeTaxesPaidNet
Interest	$ 9,865us-gaap_InterestPaid	$ 10,189us-gaap_InterestPaid	$ 8,355us-gaap_InterestPaid

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.5)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 5

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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