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Concentrations of risk and segment information - Schedule of Revenue by Geographic Segment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue, Major Customer [Line Items]    
Revenue $ 363,109us-gaap_Revenues $ 235,716us-gaap_Revenues
Americas [Member]    
Revenue, Major Customer [Line Items]    
Revenue 180,093us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
125,166us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
Europe, Middle East and Africa [Member]    
Revenue, Major Customer [Line Items]    
Revenue 139,079us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
84,174us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Asia and Pacific Area Countries [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 43,937us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
$ 26,376us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember