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Summary of Significant Accounting Policies - Narrative (Details) (USD $)
0 Months Ended 12 Months Ended
Aug. 19, 2014
Dec. 31, 2014
property
indicator
subsidiary
Dec. 31, 2013
indicator
property
Dec. 31, 2012
Aug. 19, 2014
Aug. 14, 2012
Accounting Policies [Line Items]            
Commitment fee earned $ 400,000us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate          
Capitalized personnel costs   3,100,000hpp_CapitalizedCostsPersonnel 1,900,000hpp_CapitalizedCostsPersonnel      
Capitalized interest   6,900,000us-gaap_InterestCostsCapitalized 4,600,000us-gaap_InterestCostsCapitalized      
Construction costs capitalization period after substantially complete   1 year        
Impairment of Long-Lived Assets            
Impairment loss from discontinued operations       0us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown    
Number of properties held for sale   1hpp_NumberOfRealEstatePropertiesHeldForSale 0hpp_NumberOfRealEstatePropertiesHeldForSale      
Goodwill            
Goodwill   8,754,000us-gaap_Goodwill 8,754,000us-gaap_Goodwill      
Goodwill impairment indicators noted   0hpp_GoodwillImpairmentIndicators 0hpp_GoodwillImpairmentIndicators      
Accounts Receivable and Allowance for Doubtful Accounts            
Allowance for doubtful accounts   1,040,000us-gaap_AllowanceForDoubtfulAccountsReceivable 1,036,000us-gaap_AllowanceForDoubtfulAccountsReceivable      
Bad debt expense (recovery)   (97,000)us-gaap_ProvisionForDoubtfulAccounts 959,000us-gaap_ProvisionForDoubtfulAccounts 724,000us-gaap_ProvisionForDoubtfulAccounts    
Notes Receivable            
Notes receivable, maximum principal 140,000,000hpp_LoansandLeasesReceivableMaximumPrincipal       140,000,000hpp_LoansandLeasesReceivableMaximumPrincipal  
Notes receivable, share of maximum principal, percentage 23.77%hpp_LoansandLeasesReceivableShareofMaximumPrincipalPercentage       23.77%hpp_LoansandLeasesReceivableShareofMaximumPrincipalPercentage  
Notes receivable, share of maximum principal, amount 33,300,000hpp_LoansandLeasesReceivableShareofMaximumPrincipal       33,300,000hpp_LoansandLeasesReceivableShareofMaximumPrincipal  
Notes receivable, gross   28,500,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount        
Note receivable, interest rate 11.00%hpp_LoansandLeasesReceivableInterestRateStatedPercentage          
Notes receivable from loan acquired   28,268,000us-gaap_LoansAndLeasesReceivableNetReportedAmount 0us-gaap_LoansAndLeasesReceivableNetReportedAmount      
Notes receivable basis points (as a percent)           13.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
Notes receivable, basis points floor (as a percent)           1.00%hpp_LoansReceivableBasisSpreadOnVariableRateBasisPointFloor
Income Taxes            
Income tax expense   0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit      
Number of subsidiaries   1hpp_NumberofSubsidiaries        
Building Improvements            
Accounting Policies [Line Items]            
Estimated useful life   39 years        
Land Improvements            
Accounting Policies [Line Items]            
Estimated useful life   15 years        
Furniture and Fixtures [Member] | Minimum            
Accounting Policies [Line Items]            
Estimated useful life   5 years        
Furniture and Fixtures [Member] | Maximum            
Accounting Policies [Line Items]            
Estimated useful life   7 years        
Allowance for Straight-Line Receivables [Member]            
Accounts Receivable and Allowance for Doubtful Accounts            
Allowance for doubtful accounts   600,000us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= hpp_AllowanceForStraightLineReceivablesMember
300,000us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= hpp_AllowanceForStraightLineReceivablesMember
     
Cash Flow Hedging [Member]            
Derivative Financial Instruments            
Number of interest rate contracts   3us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
       
Early Adoption of ASU 2014-08 [Member]            
Income Taxes            
Gain on sale of real estate   $ 5,500,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_AdjustmentsForNewAccountingPrincipleEarlyAdoptionMember