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Organization and Basis of Presentations - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2015
sqft
Contract
Basis of Presentation [Line Items]  
Area of an real estate property 14,200,000rpt_AreaOccupied
Number of Joint Ventures 4rpt_NumberOfJointVentures
Ownership interest in Ramco-Gershenson Properties, L. P. 97.20%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Shopping Centers  
Basis of Presentation [Line Items]  
Number of real estate properties owned and managed 67us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= rpt_ShoppingCentersMember
Number of Joint Ventures 2rpt_NumberOfJointVentures
/ us-gaap_RealEstatePropertiesAxis
= rpt_ShoppingCentersMember
Office building  
Basis of Presentation [Line Items]  
Number of real estate properties owned and managed 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_OfficeBuildingMember
Ramco/Lion Venture LP  
Basis of Presentation [Line Items]  
Percentage of ownership 20.00%rpt_PercentageOfOwnership
/ dei_LegalEntityAxis
= rpt_RamcoFourHundredFiftyVentureLlcMember
Ramco/Lion Venture LP | Shopping Centers  
Basis of Presentation [Line Items]  
Number of real estate properties owned and managed 8us-gaap_NumberOfRealEstateProperties
/ dei_LegalEntityAxis
= rpt_RamcoFourHundredFiftyVentureLlcMember
/ us-gaap_RealEstatePropertiesAxis
= rpt_ShoppingCentersMember
Area of an real estate property 1,600,000rpt_AreaOccupied
/ dei_LegalEntityAxis
= rpt_RamcoFourHundredFiftyVentureLlcMember
/ us-gaap_RealEstatePropertiesAxis
= rpt_ShoppingCentersMember
Ramco 450 Venture LLC  
Basis of Presentation [Line Items]  
Percentage of ownership 30.00%rpt_PercentageOfOwnership
/ dei_LegalEntityAxis
= rpt_RamcoLionVentureLpMember
Ramco 450 Venture LLC | Shopping Centers  
Basis of Presentation [Line Items]  
Number of real estate properties owned and managed 2us-gaap_NumberOfRealEstateProperties
/ dei_LegalEntityAxis
= rpt_RamcoLionVentureLpMember
/ us-gaap_RealEstatePropertiesAxis
= rpt_ShoppingCentersMember
Area of an real estate property 600,000rpt_AreaOccupied
/ dei_LegalEntityAxis
= rpt_RamcoLionVentureLpMember
/ us-gaap_RealEstatePropertiesAxis
= rpt_ShoppingCentersMember
Smaller joint ventures  
Basis of Presentation [Line Items]  
Number of Joint Ventures 2rpt_NumberOfJointVentures
/ dei_LegalEntityAxis
= rpt_OtherJointVenturesMember