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Revenue Recognition- Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	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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The total amount of subcontractor fees not included in revenues.

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