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Segment Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 03, 2014 | Sep. 27, 2013 | Oct. 03, 2014 | Sep. 27, 2013
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 78,557 | $ 75,231 | $ 231,093 | $ 223,396
Operating income | 19,238 | 15,160 | 49,416 | 43,604
Capital expenditures | 1,930 | 892 | 3,906 | 4,593
Depreciation and amortization | 1,346 | 1,283 | 3,979 | 3,667
Engineering and Other Scientific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 57,491 | 56,395 | 168,611 | 163,353
Operating income | 18,939 | 18,115 | 55,457 | 51,747
Capital expenditures | 1,509 | 664 | 2,833 | 3,924
Depreciation and amortization | 923 | 813 | 2,664 | 2,269
Environmental and Health |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 21,066 | 18,836 | 62,482 | 60,043
Operating income | 7,007 | 5,624 | 20,171 | 19,104
Capital expenditures | 36 | 41 | 151 | 110
Depreciation and amortization | 49 | 76 | 145 | 221
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 25,946 | 23,739 | 75,628 | 70,851
Capital expenditures | 1,545 | 705 | 2,984 | 4,034
Depreciation and amortization | 972 | 889 | 2,809 | 2,490
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | (6,708) | (8,579) | (26,212) | (27,247)
Capital expenditures | 385 | 187 | 922 | 559
Depreciation and amortization | $ 374 | $ 394 | $ 1,170 | $ 1,177

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + 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 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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