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Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 133,336	$ 127,179	$ 413,866	$ 385,938
Operating Income	33,933	36,813	92,928	118,807
Capital Expenditures	1,814	2,090	17,242	9,541
Depreciation and Amortization	2,361	1,723	6,535	5,224
Operating segments
Segment Reporting Information [Line Items]
Operating Income	46,209	45,763	143,614	138,966
Capital Expenditures	566	918	3,349	3,154
Depreciation and Amortization	1,803	1,149	4,583	3,425
Corporate
Segment Reporting Information [Line Items]
Operating Income	(12,276)	(8,950)	(50,686)	(20,159)
Capital Expenditures	1,248	1,172	13,893	6,387
Depreciation and Amortization	558	574	1,952	1,799
Engineering and Other Scientific | Operating segments
Segment Reporting Information [Line Items]
Revenues	110,857	107,403	344,552	321,168
Operating Income	38,734	39,385	121,064	117,907
Capital Expenditures	541	870	3,210	3,050
Depreciation and Amortization	1,750	1,108	4,428	3,301
Environmental and Health | Operating segments
Segment Reporting Information [Line Items]
Revenues	22,479	19,776	69,314	64,770
Operating Income	7,475	6,378	22,550	21,059
Capital Expenditures	25	48	139	104
Depreciation and Amortization	$ 53	$ 41	$ 155	$ 124

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