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Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Apr. 01, 2022
Segment Reporting Information [Line Items]
Revenues	$ 140,309	$ 128,478
Operating Income	29,120	36,717
Capital Expenditures	5,861	2,795
Depreciation and Amortization	1,988	1,689
Operating segments
Segment Reporting Information [Line Items]
Operating Income	51,173	46,325
Capital Expenditures	1,503	614
Depreciation and Amortization	1,354	1,081
Corporate
Segment Reporting Information [Line Items]
Operating Income	(22,053)	(9,608)
Capital Expenditures	4,358	2,181
Depreciation and Amortization	634	608
Engineering and Other Scientific | Operating segments
Segment Reporting Information [Line Items]
Revenues	117,048	104,615
Operating Income	43,619	38,490
Capital Expenditures	1,408	564
Depreciation and Amortization	1,306	1,039
Environmental and Health | Operating segments
Segment Reporting Information [Line Items]
Revenues	23,261	23,863
Operating Income	7,554	7,835
Capital Expenditures	95	50
Depreciation and Amortization	$ 48	$ 42

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