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Business (Details)
Mar. 31, 2015
state
property
Dec. 31, 2014
property
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Number of properties in which ownership interest is held by the entity 34us-gaap_NumberOfRealEstateProperties  
Number of Properties Held for Sale 4tier_NumberofPropertiesHeldforSale 3tier_NumberofPropertiesHeldforSale
Number of recently developed non-operating properties 1tier_Numberofrecentlydevelopednonoperatingproperties  
Number of retail properties 1tier_Numberofretailproperties  
Number of markets in which the entity owned interests in properties 17tier_NumberofMarketsinwhichEntityOperates