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Subsequent Events - Acquisitions (Details) (Office, Subsequent Event [Member], USD $)
0 Months Ended
Jan. 07, 2015
Jan. 07, 2015
Office | Subsequent Event [Member]
   
Subsequent Event [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 45.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
45.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Joint Venture, Interest in Real Estate, Sales Price $ 219.2hpp_JointVentureInterestinRealEstateSalesPrice
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember