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Equity - Non-controlling Interests Narrative (Details)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2012
sqft
Jun. 14, 2013
sqft
Class of Stock      
Common units held by noncontrolling interests 2,382,563hpp_NoncontrollingInterestOwnershipByNoncontrollingOwnersAmount    
Pinnacle JV      
Class of Stock      
Number of buildings in property 2hpp_NumberOfBuildingsInProperty
/ us-gaap_BusinessAcquisitionAxis
= hpp_PinnacleJvMember		    
Area of real estate property 625,640us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= hpp_PinnacleJvMember		    
Ownership interest in property 65.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hpp_PinnacleJvMember		    
Pinnacle II      
Class of Stock      
Business acquisition, area of real estate property (in sqft)   231,864hpp_BusinessAcquisitionAreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= hpp_PinnacleIIMember		  
Pinnacle I      
Class of Stock      
Ownership interest in property     98.25%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hpp_PinnacleIMember
Business acquisition, area of real estate property (in sqft)     393,776hpp_BusinessAcquisitionAreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= hpp_PinnacleIMember
Common Units      
Class of Stock      
Shares used for valuation of redemption 1hpp_NoncontrollingInterestEquitySharesUsedForValuationOfRedemptionNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
Conversion ratio 1hpp_CommonStockConversionRatio
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember