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Severance and Other Charges (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]    
Severance and other charges $ 11,973us-gaap_RestructuringCharges $ 0us-gaap_RestructuringCharges
Minimum    
Restructuring Cost and Reserve [Line Items]    
Expected number of positions eliminated 400us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum    
Restructuring Cost and Reserve [Line Items]    
Expected number of positions eliminated 600us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Restructuring Charges    
Restructuring Cost and Reserve [Line Items]    
Severance and other charges 11,973us-gaap_RestructuringCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_RestructuringChargesMember		  
International Services | Restructuring Charges    
Restructuring Cost and Reserve [Line Items]    
Severance and other charges 400us-gaap_RestructuringCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_RestructuringChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= fi_InternationalServicesMember		  
U.S. Services | Restructuring Charges    
Restructuring Cost and Reserve [Line Items]    
Severance and other charges 10,700us-gaap_RestructuringCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_RestructuringChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= fi_U.S.ServicesMember		  
Sales | Restructuring Charges    
Restructuring Cost and Reserve [Line Items]    
Severance and other charges $ 900us-gaap_RestructuringCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_RestructuringChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SalesMember