XML 22 R43.htm IDEA: XBRL DOCUMENT v3.3.0.814
Concentrations of risk and segment information - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Revenue, Major Customer [Line Items]          
Accounts receivable sold during the period $ 55,100 $ 52,400 $ 140,900 $ 121,600  
Factoring fees 500 500 1,200 1,100  
Revenue 400,340 279,971 1,183,368 760,292  
United States [Member]          
Revenue, Major Customer [Line Items]          
Revenue 169,200 $ 185,600 513,600 $ 428,900  
Formerly APAC to EMEA Region [Member]          
Revenue, Major Customer [Line Items]          
Revenue     13,400    
Outside the United States [Member]          
Revenue, Major Customer [Line Items]          
Long-lived assets $ 46,700   $ 46,700   $ 25,400