Acquisitions (Details) (USD $)				12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Prospero [Member]	Dec. 31, 2013 Lorien [Member]	Dec. 31, 2012 Information Horizons [Member]	Jun. 29, 2012 Asentus [Member]	Dec. 31, 2012 Asentus [Member]	Dec. 31, 2012 Rovsing Dynamics [Member]	Dec. 31, 2012 Blessing White [Member]	Dec. 31, 2011 Communication Consulting [Member]	Dec. 31, 2011 Ultra Training [Member]	Dec. 31, 2011 Rwd Technologies, Llc [Member]	Dec. 31, 2011 Beneast Training [Member]
Business Acquisition [Line Items]
Acquisition date				May 31, 2013	Jun. 12, 2013	May 01, 2012		Jun. 29, 2012	Sep. 17, 2012	Oct. 01, 2012	Feb. 01, 2011	Apr. 01, 2011	Apr. 15, 2011	Aug. 01, 2011
Cash purchase price				$ 7,028,000	$ 6,734,000	$ 531,000	$ 1,100,000	$ 1,417,000	$ 720,000	$ 10,529,000	$ 1,505,000	$ 3,420,000	$ 25,760,000	$ 6,771,000
Fair value of contingent consideration				3,670,000	573,000	0		765,000	0	0	112,000	0	0	0
Total purchase price				10,698,000	7,307,000	531,000		2,182,000	720,000	10,529,000	1,617,000	3,420,000	25,760,000	6,771,000
Purchase price allocation:
Cash				0	23,000	0		396,000	20,000	830,000	0	347,000	81,000	2,236,000
Accounts receivable				0	1,856,000	0		1,970,000	0	2,796,000	0	340,000	13,667,000	375,000
Other assets				7,000	1,553,000	0		411,000	898,000	527,000	0	188,000	2,261,000	104,000
Property, plant and equipment				51,000	116,000	26,000		46,000	5,000	76,000	16,000	42,000	573,000	192,000
Intangible assets				2,801,000	1,715,000	505,000		443,000	775,000	3,280,000	390,000	1,412,000	3,726,000	2,706,000
Goodwill	116,987,000	102,821,000	93,338,000	8,112,000	5,494,000	0		1,957,000	458,000	6,070,000	1,211,000	2,336,000	13,059,000	3,790,000
Total assets				10,971,000	10,757,000	531,000		5,223,000	2,156,000	13,579,000	1,617,000	4,665,000	33,367,000	9,403,000
Accounts payable and accrued expenses				40,000	1,975,000	0		2,708,000	428,000	1,456,000	0	878,000	6,299,000	1,956,000
Billings in excess of costs and estimated earnings on uncompleted contracts				233,000	1,132,000	0		247,000	1,008,000	282,000	0	0	1,308,000	0
Deferred tax liability				0	343,000	0		86,000	0	1,312,000	0	367,000	0	676,000
Total liabilities				273,000	3,450,000	0		3,041,000	1,436,000	3,050,000	0	1,245,000	7,607,000	2,632,000
Net assets acquired				$ 10,698,000	$ 7,307,000	$ 531,000		$ 2,182,000	$ 720,000	$ 10,529,000	$ 1,617,000	$ 3,420,000	$ 25,760,000	$ 6,771,000