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Revenue Recognition- Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2018 | Dec. 29, 2017 | [1] | Dec. 30, 2016 | [1]
Revenues | $ 92,143,000 | $ 95,302,000 | $ 95,621,000 | $ 96,457,000 | $ 88,282,000 | $ 87,555,000 | $ 87,840,000 | $ 84,122,000 | $ 379,523,000 | [1] | $ 347,799,000 | $ 315,076,000
Deferred Revenue, Revenue Recognized |  |  |  |  |  |  |  |  | 6,067,000 |  |  |
Subcontractor Fees Not Included In Revenues |  |  |  |  |  |  |  |  | 23,174,000 |  |  |
Sales Revenue, Net [Member] | Time And Materials Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 312,772,000 |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 82.00% |  |  |
Sales Revenue, Net [Member] | Fixed Price Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 66,751,000 |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 18.00% |  |  |
Engineering and Other Scientific [Member] | Time And Materials Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 243,085,000 |  |  |
Engineering and Other Scientific [Member] | Fixed Price Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 63,180,000 |  |  |
Environmental and Health [Member] | Time And Materials Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 69,687,000 |  |  |
Environmental and Health [Member] | Fixed Price Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 3,571,000 |  |  |
[1] | Geographic revenues are allocated based on the location of the client.

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