Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue	$ 99,671	$ 88,948	$ 295,587	$ 239,275
Gain on reversal of deferred rent liability	0	0	0	(1,041)
Gain (loss) on change in fair value of contingent consideration, net	(792)	303	(863)	506
Operating income	8,247	7,567	25,463	19,703
Interest expense	(75)	(51)	(175)	(149)
Other income	72	157	262	498
Income before income tax expense	8,244	7,673	25,550	20,052
Learning Solutions [Member]
Revenue	41,897	33,230	115,336	94,663
Operating income	4,611	2,660	11,949	6,309
Professional and Technical Services [Member]
Revenue	20,938	22,289	67,891	61,530
Operating income	993	2,551	4,181	5,482
Sandy Training and Marketing [Member]
Revenue	16,878	13,163	51,083	39,301
Operating income	1,078	644	3,286	1,805
Performance Readiness Group [Member]
Revenue	13,682	14,884	42,810	26,896
Operating income	556	70	2,007	652
Energy Services [Member]
Revenue	6,276	5,382	18,467	16,885
Operating income	$ 1,801	$ 1,339	$ 4,903	$ 3,908