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Equity Investments in Unconsolidated Joint Ventures - Investments in Unconsolidated Joint Ventures (Additional Detail) (Detail)
 3 Months Ended
Mar. 31, 2015
Property
Contract
Schedule of Equity Method Investments [Line Items]  
Number of Joint Ventures 4rpt_NumberOfJointVentures
Number of Properties Owned by Joint Venture 1rpt_NumberofPropertiesOwnedbyJointVenture
Other Joint Ventures  
Schedule of Equity Method Investments [Line Items]  
Number of Joint Ventures 2rpt_NumberOfJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherInvestmentsMember
Minimum  
Schedule of Equity Method Investments [Line Items]  
Percentage of ownership interest 7.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum | Other Joint Ventures  
Schedule of Equity Method Investments [Line Items]  
Percentage of ownership interest 7.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherInvestmentsMember