Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Goodwill [Roll Forward]
Balance as of December 31, 2013	$ 92,052,000
Balance as of March 31, 2014	92,052,000
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Total	115,804,000		115,804,000
Accumulated Amortization	(35,063,000)		(32,522,000)
Accumulated Impairment Loss	(1,025,000)		(1,025,000)
Net Intangible Assets	79,716,000		82,257,000
Amortization of Intangible Assets	2,500,000	2,500,000
Contract-Related [Member]
Finite-Lived Intangible Assets [Line Items]
Contract-related	93,304,000		93,304,000
Accumulated Amortization	(28,175,000)		(26,287,000)
Accumulated Impairment Loss	(1,025,000)		(1,025,000)
Net Intangible Assets	64,104,000		65,992,000
Acquired Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired technologies	12,400,000		12,400,000
Accumulated Amortization	(3,178,000)		(2,896,000)
Accumulated Impairment Loss	0		0
Net Intangible Assets	9,222,000		9,504,000
Trade Names - Amortizable [Member]
Finite-Lived Intangible Assets [Line Items]
Trade name - amortizable	10,100,000		10,100,000
Accumulated Amortization	(3,710,000)		(3,339,000)
Accumulated Impairment Loss	0		0
Net Intangible Assets	6,390,000		6,761,000
Supply Chain Management Group [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2013			61,169,000
Balance as of March 31, 2014	61,169,000		61,169,000
IT, Energy and Management Consulting Group [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2013			30,883,000
Balance as of March 31, 2014	$ 30,883,000		$ 30,883,000