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Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 04, 2014
Jun. 28, 2013
Jul. 04, 2014
Jun. 28, 2013
Segment Reporting Information [Line Items]        
Revenues $ 76,574 $ 75,505 $ 152,536 $ 148,165
Operating income 16,084 17,593 30,178 28,444
Capital expenditures 1,061 1,742 1,976 3,701
Depreciation and amortization 1,311 1,235 2,633 2,384
Engineering and Other Scientific
        
Segment Reporting Information [Line Items]        
Revenues 55,293 53,635 111,120 106,958
Operating income 17,700 16,758 36,518 33,632
Capital expenditures 794 1,573 1,324 2,934
Depreciation and amortization 868 757 1,741 1,456
Environmental and Health
        
Segment Reporting Information [Line Items]        
Revenues 21,281 21,870 41,416 41,207
Operating income 7,191 7,900 13,164 13,480
Capital expenditures 60 31 115 69
Depreciation and amortization 49 71 96 145
Operating segments
        
Segment Reporting Information [Line Items]        
Operating income 24,891 24,658 49,682 47,112
Capital expenditures 854 1,604 1,439 3,003
Depreciation and amortization 917 828 1,837 1,601
Corporate
        
Segment Reporting Information [Line Items]        
Operating income (8,807) (7,065) (19,504) (18,668)
Capital expenditures 207 138 537 698
Depreciation and amortization $ 394 $ 407 $ 796 $ 783