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Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenues	$ 144,933	$ 140,309
Operating Income	30,713	29,120
Capital Expenditures	1,509	5,861
Depreciation and Amortization	2,324	1,988
Operating segments
Segment Reporting Information [Line Items]
Operating Income	56,867	51,173
Capital Expenditures	446	1,503
Depreciation and Amortization	1,677	1,354
Corporate
Segment Reporting Information [Line Items]
Operating Income	(26,154)	(22,053)
Capital Expenditures	1,063	4,358
Depreciation and Amortization	647	634
Engineering and Other Scientific | Operating segments
Segment Reporting Information [Line Items]
Revenues	121,471	117,048
Operating Income	48,631	43,619
Capital Expenditures	417	1,408
Depreciation and Amortization	1,628	1,306
Environmental and Health | Operating segments
Segment Reporting Information [Line Items]
Revenues	23,462	23,261
Operating Income	8,236	7,554
Capital Expenditures	29	95
Depreciation and Amortization	$ 49	$ 48

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