Basis of Presentation and General Information (Summary of Disaggregation of Total Revenue Including Reimbursable Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 27, 2020	Mar. 29, 2019
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	$ 69,533	$ 67,155
Consulting [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	63,311	61,831
Software License Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	1,875	539
Revenue Before Reimbursements [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	$ 65,186	$ 62,370

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration