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Segment Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2015
Jul. 04, 2014
Jul. 03, 2015
Jul. 04, 2014
Segment Reporting Information [Line Items]        
Revenues $ 79,864 $ 76,574 $ 160,157 $ 152,536
Operating Income 18,705 16,084 33,733 30,178
Capital Expenditures 1,087 1,061 1,714 1,976
Depreciation and Amortization 1,324 1,311 2,705 2,633
Engineering and Other Scientific        
Segment Reporting Information [Line Items]        
Revenues 59,359 55,293 119,160 111,120
Operating Income 19,108 17,700 38,353 36,518
Capital Expenditures 819 794 1,211 1,324
Depreciation and Amortization 822 868 1,926 1,741
Environmental and Health        
Segment Reporting Information [Line Items]        
Revenues 20,505 21,281 40,997 41,416
Operating Income 6,631 7,191 13,095 13,164
Capital Expenditures 47 60 71 115
Depreciation and Amortization 44 49 87 96
Operating segments        
Segment Reporting Information [Line Items]        
Operating Income 25,739 24,891 51,448 49,682
Capital Expenditures 866 854 1,282 1,439
Depreciation and Amortization 866 917 2,013 1,837
Corporate        
Segment Reporting Information [Line Items]        
Operating Income (7,034) (8,807) (17,715) (19,504)
Capital Expenditures 221 207 432 537
Depreciation and Amortization $ 458 $ 394 $ 692 $ 796