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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Disaggregation of Revenue
Consulting services revenues	$ 105,849	$ 99,476
United States
Disaggregation of Revenue
Consulting services revenues	83,529	76,860
United Kingdom
Disaggregation of Revenue
Consulting services revenues	18,507	17,505
Other
Disaggregation of Revenue
Consulting services revenues	3,813	5,111
Fixed Price
Disaggregation of Revenue
Consulting services revenues	21,386	20,714
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 84,463	$ 78,762

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
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-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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