Derivative Instruments (Details)	3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2013 EUR (€)	Mar. 31, 2013 GBP (£)	Mar. 31, 2013 JPY (¥)	Dec. 31, 2012 EUR (€)	Dec. 31, 2012 GBP (£)	Dec. 31, 2012 JPY (¥)	Mar. 31, 2013 Not designated as Hedges [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] USD ($)	Mar. 31, 2013 Not designated as Hedges [Member] Prepaid Expenses and Other Current Assets [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Prepaid Expenses and Other Current Assets [Member] USD ($)	Mar. 31, 2013 Not designated as Hedges [Member] Other assets [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other assets [Member] USD ($)	Mar. 31, 2013 Not designated as Hedges [Member] Other Current Liabilities [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other Current Liabilities [Member] USD ($)	Mar. 31, 2013 Not designated as Hedges [Member] Other liabilities [Member] USD ($)	Dec. 31, 2012 Not designated as Hedges [Member] Other liabilities [Member] USD ($)
Derivative Instruments [Abstract]
Foreign exchange contract outstanding			€ 17,100,000	£ 800,000	¥ 62,100,000	€ 9,900,000	£ 800,000	¥ 61,800,000
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives									748,000	316,000	718,000	296,000	30,000	20,000
Liability derivatives									(225,000)	(339,000)					(155,000)	(190,000)	(70,000)	(149,000)
Net fair value									523,000	(23,000)
Gain (loss) from derivative instruments [Abstract]
Foreign exchange contracts- change in fair value	549,000	186,000
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals	(282,000)	214,000
Gain (loss) on derivative, net	$ 267,000	$ 400,000