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Investment in Equity Method Investee (Details) (USD $)
3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
PGS Consultoria e Serviços Ltda. [Member]
Mar. 31, 2012
PGS Consultoria e Serviços Ltda. [Member]
Mar. 31, 2013
Investments in and advances to unconsolidated affiliates, net [Member]
PGS Consultoria e Serviços Ltda. [Member]
Dec. 31, 2012
Investments in and advances to unconsolidated affiliates, net [Member]
PGS Consultoria e Serviços Ltda. [Member]
Mar. 31, 2013
Accumulated Other Comprehensive Income [Member]
Mar. 31, 2012
Accumulated Other Comprehensive Income [Member]
Mar. 31, 2013
Accumulated Other Comprehensive Income [Member]
PGS Consultoria e Serviços Ltda. [Member]
Mar. 31, 2012
Accumulated Other Comprehensive Income [Member]
PGS Consultoria e Serviços Ltda. [Member]
Mar. 31, 2013
Income from operations of unconsolidated affiliates [Member]
PGS Consultoria e Serviços Ltda. [Member]
Mar. 31, 2012
Income from operations of unconsolidated affiliates [Member]
PGS Consultoria e Serviços Ltda. [Member]
Equity Method Investment, Summarized Financial Information, Brazilian Joint Venture [Line Items]                        
Equity method investment, ownership percentage     50.00%                  
Equity method investments         $ 39,300,000 $ 36,000,000            
Foreign currency translation adjustment (4,532,000) 3,149,000         (4,532,000) 3,149,000 400,000 600,000    
Income from equity method investments 2,858,000 2,404,000                 2,900,000 2,400,000
Net revenue from sales     65,933,000 58,564,000                
Gross profit     45,323,000 40,824,000                
Income from continuing operations     7,077,000 8,147,000                
Net income     $ 4,764,000 $ 4,808,000