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Build-to-Suit Leases (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Build-to-Suit Leases    
Finance lease obligations for build-to-suit leases $ 146.6rax_FinanceLeaseObligationsforBuildtoSuitLeases $ 117.4rax_FinanceLeaseObligationsforBuildtoSuitLeases
Build-to-suit construction projects that have failed sale leaseback | Reclassified from capital lease obligations to finance lease obligations for build-to-suit leases    
Build-to-Suit Leases    
Finance lease obligations for build-to-suit leases 7.4rax_FinanceLeaseObligationsforBuildtoSuitLeases
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= rax_BuildtosuitconstructionprojectsthathavefailedsaleleasebackMember
/ us-gaap_StatementScenarioAxis
= rax_ScenarioReclassificationMember		 7.4rax_FinanceLeaseObligationsforBuildtoSuitLeases
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= rax_BuildtosuitconstructionprojectsthathavefailedsaleleasebackMember
/ us-gaap_StatementScenarioAxis
= rax_ScenarioReclassificationMember
Data center in the U.K. real estate project | Buildings and leasehold improvements    
Build-to-Suit Leases    
Construction costs placed into service $ 51.4us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= rax_RealEstateProjectDataCenterintheU.K.Member