Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 117,880	$ 101,373
Gain on change in fair value of contingent consideration, net	377	247
Operating income	7,143	7,339
Interest expense	205	100
Other income	189	229
Income before income tax expense	7,127	7,468
Learning Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	52,967	42,734
Operating income	1,048	3,212
Professional and Technical Services [Member]
Segment Reporting Information [Line Items]
Revenue	19,910	18,015
Operating income	2,361	1,058
Sandy Training and Marketing [Member]
Segment Reporting Information [Line Items]
Revenue	14,258	14,998
Operating income	577	629
Performance Readiness Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	13,009	15,500
Operating income	501	579
Energy Services [Member]
Segment Reporting Information [Line Items]
Revenue	17,736	10,126
Operating income	$ 2,279	$ 1,614