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Derivative Instruments (Details)
 3 Months Ended
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Mar. 31, 2014
EUR (€)
Mar. 31, 2014
GBP (£)
Mar. 31, 2014
JPY (¥)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
EUR (€)
Dec. 31, 2013
GBP (£)
Dec. 31, 2013
JPY (¥)
Mar. 31, 2014
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
USD ($)
Mar. 31, 2014
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Prepaid expenses and other current assets [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Prepaid expenses and other current assets [Member]
USD ($)
Mar. 31, 2014
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other assets [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other assets [Member]
USD ($)
Mar. 31, 2014
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other current liabilities [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other current liabilities [Member]
USD ($)
Mar. 31, 2014
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other liabilities [Member]
USD ($)
Dec. 31, 2013
Foreign Exchange Contract [Member]
Not designated as Hedges [Member]
Other liabilities [Member]
USD ($)
Notional Disclosures [Abstract]                                      
Derivative, Maturity Date   May 01, 2016                                  
Foreign exchange contract outstanding     € 5,300,000 £ 200,000 ¥ 2,200,000   € 13,300,000 £ 200,000 ¥ 10,100,000                    
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]                                      
Asset derivatives 49,000         142,000           49,000 140,000 0 2,000        
Liability derivatives (319,000)         (655,000)                   (315,000) (637,000) (4,000) (18,000)
Net fair value                   (270,000) (513,000)                
Gain (loss) from derivative instruments [Abstract]                                      
Foreign exchange contracts- change in fair value 243,000 549,000                                  
Remeasurement of related contract receivables, billings in excess of revenue earned, and subcontractor accruals (139,000) (282,000)                                  
Gain on derivative instruments, net $ 104,000 $ 267,000