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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Disaggregation of Revenue |  |  |  |
Consulting services revenues | $ 103,871 | $ 91,325 | $ 308,885 | $ 273,059
United States |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | 80,721 | 70,910 | 244,878 | 217,609
United Kingdom |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | 17,253 | 13,572 | 47,317 | 40,444
Countries Other Than United States, United Kingdom |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | 5,897 | 6,843 | 16,690 | 15,006
Fixed Price |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | 25,047 | 23,330 | 66,440 | 70,235
Time-and-materials |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | $ 78,824 | $ 67,995 | $ 242,445 | $ 202,824

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