Summary of Significant Accounting Policies - Summary of IT Solutions and IT and Other Staffing Revenue as Percentage of Total Revenue (Details) - Product Concentration Risk [Member] - Sales Revenue, Services, Net [Member]	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Product Information [Line Items]
Revenue, percent	100.00%	100.00%
IT Solutions [Member]
Product Information [Line Items]
Revenue, percent	30.60%	29.80%
IT and Other Staffing [Member]
Product Information [Line Items]
Revenue, percent	69.40%	70.20%