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Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Segment Reporting Information [Line Items]
Revenues	$ 77,295	$ 79,864	$ 160,451	$ 160,157
Operating Income	14,931	18,705	31,367	33,733
Capital Expenditures	1,901	1,087	3,382	1,714
Depreciation and Amortization	1,524	1,324	2,927	2,705
Operating segments
Segment Reporting Information [Line Items]
Operating Income	23,589	25,739	49,922	51,448
Capital Expenditures	1,311	866	2,524	1,282
Depreciation and Amortization	1,161	866	2,225	2,013
Engineering and Other Scientific
Segment Reporting Information [Line Items]
Revenues	60,979	59,359	125,789	119,160
Operating Income	19,561	19,108	40,699	38,353
Capital Expenditures	1,273	819	2,463	1,211
Depreciation and Amortization	1,116	822	2,137	1,926
Environmental and Health
Segment Reporting Information [Line Items]
Revenues	16,316	20,505	34,662	40,997
Operating Income	4,028	6,631	9,223	13,095
Capital Expenditures	38	47	61	71
Depreciation and Amortization	45	44	88	87
Corporate
Segment Reporting Information [Line Items]
Operating Income	(8,658)	(7,034)	(18,555)	(17,715)
Capital Expenditures	590	221	858	432
Depreciation and Amortization	$ 363	$ 458	$ 702	$ 692

X

- 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=66902209&loc=d3e3602-108585

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+ References

No definition available.

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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=66902209&loc=d3e3213-108585

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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=63488584&loc=d3e20235-122688

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