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Bank borrowings (Details)
In Millions, unless otherwise specified
Jun. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2012
Italian line of credit
USD ($)
Jun. 30, 2012
Italian line of credit
EUR (€)
Dec. 31, 2011
Italian line of credit
USD ($)
Dec. 31, 2011
Italian line of credit
EUR (€)
Bank borrowings            
Amount outstanding under line of credit $ 0.5 $ 1.3        
Weighted average interest rate on borrowings under lines of credit (as a percent) 3.41% 4.02%        
Maximum borrowing capacity     $ 8.7 € 6.9 $ 8.1 € 6.3