Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Balance	$ 116,987
Foreign currency translation	(81)
Balance	116,906
Learning Solutions [Member]
Finite-Lived Intangible Assets [Line Items]
Balance	60,187
Foreign currency translation	(80)
Balance	60,107
Professional and Technical Services [Member]
Finite-Lived Intangible Assets [Line Items]
Balance	37,690
Foreign currency translation	0
Balance	37,690
Sandy Training & Marketing [Member]
Finite-Lived Intangible Assets [Line Items]
Balance	653
Foreign currency translation	0
Balance	653
Performance Readiness Group [Member]
Finite-Lived Intangible Assets [Line Items]
Balance	9,795
Foreign currency translation	0
Balance	9,795
Energy Services [Member]
Finite-Lived Intangible Assets [Line Items]
Balance	8,662
Foreign currency translation	(1)
Balance	$ 8,661