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Revenue Recognition- Summary of Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 27, 2019 | Sep. 28, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 101,548 | $ 95,302 | $ 307,085 | $ 287,380
Concentration Risk, Percentage | 10.00% | 10.00% | 10.00% | 10.00%
Time And Materials Contracts [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 85.30% | 80.10% | 84.90% | 83.30%
Fixed Price Contracts [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 14.70% | 19.90% | 15.10% | 16.70%
Engineering and Other Scientific [Member] | Time And Materials Contracts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 68,859 | $ 59,582 | $ 205,999 | $ 186,486
Engineering and Other Scientific [Member] | Fixed Price Contracts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 14,201 | 18,315 | 44,135 | 45,494
Environmental and Health [Member] | Time And Materials Contracts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 17,803 | 16,755 | 54,612 | 52,987
Environmental and Health [Member] | Fixed Price Contracts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 685 | 650 | 2,339 | 2,413
Sales Revenue, Net [Member] | Time And Materials Contracts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 86,662 | 76,337 | 260,611 | 239,473
Sales Revenue, Net [Member] | Fixed Price Contracts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 14,886 | $ 18,965 | $ 46,474 | $ 47,907

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