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Business Concentrations (Details)
 12 Months Ended
Dec. 31, 2014
Geographic  
Concentration Risk [Line Items]  
Concentration risk 85.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
Labor  
Concentration Risk [Line Items]  
Number of employees 3,052dei_EntityNumberOfEmployees
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LaborForceConcentrationRiskMember
Collective bargaining agreements 13frp_CollectiveBargainingAgreements
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LaborForceConcentrationRiskMember
Labor | Workforce Subject to Collective Bargaining Arrangements  
Concentration Risk [Line Items]  
Concentration risk 63.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LaborForceConcentrationRiskMember
Number of employees 1,914dei_EntityNumberOfEmployees
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LaborForceConcentrationRiskMember
Labor | Workforce Subject to Collective Bargaining Arrangements Expiring within One Year  
Concentration Risk [Line Items]  
Number of employees 1,700dei_EntityNumberOfEmployees
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LaborForceConcentrationRiskMember
Collective bargaining agreements 2frp_CollectiveBargainingAgreements
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LaborForceConcentrationRiskMember