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Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Segment Reporting Information [Line Items]
Revenues	$ 87,840	$ 77,295	$ 171,962	$ 160,451
Operating Income	20,317	14,931	34,951	31,367
Capital Expenditures	1,219	1,901	2,526	3,382
Depreciation and Amortization	1,629	1,524	3,195	2,927
Operating segments
Segment Reporting Information [Line Items]
Operating Income	30,137	23,589	57,937	49,922
Capital Expenditures	858	1,311	1,908	2,524
Depreciation and Amortization	1,207	1,161	2,363	2,225
Engineering and Other Scientific
Segment Reporting Information [Line Items]
Revenues	69,795	60,979	136,478	125,789
Operating Income	24,313	19,561	46,634	40,699
Capital Expenditures	794	1,273	1,802	2,463
Depreciation and Amortization	1,163	1,116	2,278	2,137
Environmental and Health
Segment Reporting Information [Line Items]
Revenues	18,045	16,316	35,484	34,662
Operating Income	5,824	4,028	11,303	9,223
Capital Expenditures	64	38	106	61
Depreciation and Amortization	44	45	85	88
Corporate
Segment Reporting Information [Line Items]
Operating Income	(9,820)	(8,658)	(22,986)	(18,555)
Capital Expenditures	361	590	618	858
Depreciation and Amortization	$ 422	$ 363	$ 832	$ 702

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=98514028&loc=d3e3602-108585

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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
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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