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Revenue Recognition- Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
Revenues | $ 106,506,000 | $ 95,621,000 | $ 205,537,000 | $ 192,078,000
Concentration Risk, Percentage | 10.00% | 10.00% | 10.00% | 10.00%
Deferred Revenue, Revenue Recognized | $ 1,876,000 |  | $ 4,481,000 |
Subcontractor Fees Not Included In Revenues | 6,200,000 | $ 5,800,000 | 10,400,000 | $ 11,400,000
Engineering and Other Scientific [Member] | Time And Materials Contracts [Member] |  |  |  |
Revenues | 71,761,000 | 62,347,000 | 137,140,000 | 126,948,000
Engineering and Other Scientific [Member] | Fixed Price Contracts [Member] |  |  |  |
Revenues | 15,059,000 | 14,733,000 | 29,934,000 | 27,179,000
Environmental and Health [Member] | Time And Materials Contracts [Member] |  |  |  |
Revenues | 18,792,000 | 17,618,000 | 36,810,000 | 36,188,000
Environmental and Health [Member] | Fixed Price Contracts [Member] |  |  |  |
Revenues | 894,000 | 923,000 | 1,653,000 | 1,763,000
Sales Revenue, Net [Member] | Time And Materials Contracts [Member] |  |  |  |
Revenues | $ 90,553,000 | $ 79,965,000 | $ 173,950,000 | $ 163,136,000
Sales Revenue, Net [Member] | Time And Materials Contracts [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage | 85.00% | 84.00% | 85.00% | 85.00%
Sales Revenue, Net [Member] | Fixed Price Contracts [Member] |  |  |  |
Revenues | $ 15,953,000 | $ 15,656,000 | $ 31,587,000 | $ 28,942,000
Sales Revenue, Net [Member] | Fixed Price Contracts [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage | 15.00% | 16.00% | 15.00% | 15.00%

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