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Business Segments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
practice_area
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
practice_area
segment
reporting_unit
Jun. 30, 2019
USD ($)
Segment Reporting [Abstract]        
Number of reportable business segments | segment     2  
Segment Reporting Information [Line Items]        
Revenue $ 106,144 $ 149,413 $ 234,425 $ 288,886
Gross Profit 15,897 22,959 33,511 44,237
General and administrative expenses 14,180 15,402 31,464 31,529
Sales and marketing expenses 1,857 1,906 3,696 3,895
Restructuring charges 855 182 855 1,301
Gain on change in fair value of contingent consideration, net 0 627 0 677
Operating income (995) 6,096 (1,440) 8,189
Other income (expense) (189) 102 (689) 88
Income before income tax expense $ (1,791) 4,519 $ (3,714) 5,000
Number of reporting units | reporting_unit     4  
Number of practice areas | practice_area 4   4  
Gain on sale of business $ 0 0 $ 1,064 0
Workforce Excellence        
Segment Reporting Information [Line Items]        
Revenue 65,811 83,903 140,189 165,381
Gross Profit $ 11,402 13,763 $ 22,895 27,218
Number of practice areas | practice_area 2   2  
Business Transformation Services        
Segment Reporting Information [Line Items]        
Revenue $ 40,333 65,510 $ 94,236 123,505
Gross Profit $ 4,495 9,196 $ 10,616 17,019
Number of practice areas | practice_area 2   2  
Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 106,144 149,413    
Revenues     $ 234,425 288,886
Operating Segments | Workforce Excellence        
Segment Reporting Information [Line Items]        
Revenue 65,811 83,903    
Revenues     140,189 165,381
Operating Segments | Business Transformation Services        
Segment Reporting Information [Line Items]        
Revenue $ 40,333 $ 65,510    
Revenues     $ 94,236 $ 123,505