Acquisitions (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended		12 Months Ended
	Dec. 31, 2012	Feb. 01, 2011	Dec. 31, 2012 Asentus [Member]	Jun. 29, 2012 Asentus [Member]	Dec. 31, 2012 Communication Consulting [Member]	Dec. 31, 2011 Communication Consulting [Member]	Dec. 31, 2012 Ultra Training [Member]	Dec. 31, 2011 Ultra Training [Member]	Dec. 31, 2012 Rwd Technologies, Llc [Member]	Dec. 31, 2011 Rwd Technologies, Llc [Member]	Dec. 31, 2012 Beneast Training [Member]	Dec. 31, 2011 Beneast Training [Member]	Dec. 31, 2010 Marton House [Member]	Dec. 31, 2010 Bath Consulting [Member]	Dec. 31, 2010 Academy Of Training Ltd [Member]	Dec. 31, 2012 Information Horizons [Member]	Dec. 31, 2012 Rovsing Dynamics [Member]	Dec. 31, 2012 Blessing White [Member]	Oct. 02, 2012 Blessing White [Member]
Acquisition date			Jun. 29, 2012		Feb. 01, 2011	Feb. 01, 2011	Apr. 01, 2012	Apr. 01, 2011	Apr. 15, 2011	Apr. 15, 2011	Aug. 01, 2011	Aug. 01, 2011	Apr. 01, 2010	Nov. 01, 2010	Dec. 01, 2010	May 01, 2012	Sep. 17, 2012	Oct. 01, 2012
Cash purchase price	$ 317		$ 1,417	$ 1,100		$ 1,505		$ 3,420		$ 25,760		$ 6,771	$ 2,752	$ 1,353	$ 1,119	$ 531	$ 720	$ 10,762
Fair value of contingent consideration			765			112		0		0		0	1,614	939	133	0	0	0
Estimated working capital adjustment			0													0	0	(769)
Total purchase price			2,182	1,417		1,617		3,420		25,760		6,771	4,366	2,292	1,252	531	720	9,993	10,762
Purchase price allocation:
Cash			396			0		347		81		2,236	5	106	52	0	20	830
Accounts receivable			1,970			0		340		13,667		375	1,441	945	380	0	0	2,462
Other assets			411			0		188		2,261		104	520	102	194	0	898	192
Property, plant and equipment			46			16		42		573		192	25	34	73	26	5	76
Intangible assets		390	443			390		1,412		3,726		2,706	1,044	486	303	505	775	3,280
Goodwill			1,931			1,211		2,336		13,059		3,790	3,136	1,518	905	0	340	6,295
Total assets			5,197			1,617		4,665		33,367		9,403	6,171	3,191	1,907	531	2,038	13,135
Accounts payable and accrued expenses			2,708			0		878		6,299		1,956	1,105	763	536	0	428	1,548
Billings in excess of costs and estimated earnings on uncompleted contracts			221			0		0		1,308		0	408	0	26	0	890	282
Deferred tax liability			86			0		367		0		676	292	136	93	0	0	1,312
Total liabilities			3,015			0		1,245		7,607		2,632	1,805	899	655	0	1,318	3,142
Net assets acquired			$ 2,182			$ 1,617		$ 3,420		$ 25,760		$ 6,771	$ 4,366	$ 2,292	$ 1,252	$ 531	$ 720	$ 9,993