Business Segments (Details 4) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) reporting_unit segment practice_area	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	2
Number of Reporting Units | reporting_unit	4
Number of Practice Areas | practice_area	4
Total assets	$ 434,738	$ 365,007
United States
Segment Reporting Information [Line Items]
Total assets	280,097	215,523
United Kingdom
Segment Reporting Information [Line Items]
Total assets	72,048	75,862
Other Countries
Segment Reporting Information [Line Items]
Total assets	$ 82,593	73,622
Workforce Excellence [Member]
Segment Reporting Information [Line Items]
Number of Practice Areas | practice_area	2
Total assets	$ 283,039	241,277
Business Transformation Services [Member]
Segment Reporting Information [Line Items]
Number of Practice Areas | practice_area	2
Total assets	$ 151,699	$ 123,730