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Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Jan. 03, 2014
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 28, 2012
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Jan. 03, 2014
Dec. 28, 2012
Dec. 30, 2011
Segment Reporting Information [Line Items]                      
Revenues $ 72,772 $ 75,231 $ 75,505 $ 72,660 $ 72,946 $ 73,298 $ 74,484 $ 71,925 $ 296,168 [1] $ 292,653 [1] $ 272,446 [1]
Operating income 12,342 15,160 17,593 10,851 13,715 14,728 17,361 11,816 55,946 57,620 53,460
Capital expenditures                 6,226 4,942 3,835
Depreciation and amortization                 4,951 4,711 4,411
Engineering and Other Scientific
                     
Segment Reporting Information [Line Items]                      
Revenues                 215,972 213,304 199,772
Operating income                 67,070 62,852 57,779
Capital expenditures                 5,180 3,264 2,489
Depreciation and amortization                 3,097 2,831 2,700
Environmental and Health
                     
Segment Reporting Information [Line Items]                      
Revenues                 80,196 79,349 72,674
Operating income                 25,072 25,752 22,367
Capital expenditures                 148 289 313
Depreciation and amortization                 299 286 227
Operating segments
                     
Segment Reporting Information [Line Items]                      
Operating income                 92,142 88,604 80,146
Capital expenditures                 5,328 3,553 2,802
Depreciation and amortization                 3,396 3,117 2,927
Corporate
                     
Segment Reporting Information [Line Items]                      
Operating income                 (36,196) (30,984) (26,686)
Capital expenditures                 898 1,389 1,033
Depreciation and amortization                 $ 1,555 $ 1,594 $ 1,484
[1] Geographic revenues are allocated based on the location of the client.